Vulnerability-Lookup

BDU:2026-09771 (CVE-2026-5545)

Vulnerability from fstec – Published: 2026-07-15 – Updated: 2026-07-15 – View on bdu.fstec.ru Exploit publicly available Fixed

Title

Уязвимость программного средства для взаимодействия с серверами cURL, связанная с неверным сроком действия сеанса, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации

Summary

Уязвимость программного средства для взаимодействия с серверами cURL связана с неверным сроком действия сеанса. Эксплуатация уязвимости может позволить нарушителю, действующему удаленно, получить несанкционированный доступ к защищаемой информации

Severity

6.1 (Medium) CVSS 2.0


                      
                        AV:N/AC:H/Au:N/C:P/I:C/A:N

6.5 (Medium) CVSS 3.1


                      
                        CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Class

Architecture vulnerability

Status

Confirmed by the vendor

Exploitation

Timing and state manipulation

Incidents

Being clarified

Remediation

Software update

CWE

CWE-613 - Неверный срок действия сеанса

Aliases

CVE-2026-5545

References

8 references

URL
https://hackerone.com/reports/3642555
https://github.com/advisories/GHSA-6g7g-56fm-f8mp
https://curl.se/docs/CVE-2026-5545.html
https://curl.se/docs/CVE-2026-5545.json
https://redos.red-soft.ru/search/?iblock_id=24&q=CVE-2026-5545
https://security-tracker.debian.org/tracker/CVE-2026-5545
https://access.redhat.com/security/cve/cve-2026-5545
https://ubuntu.com/security/CVE-2026-5545

Impacted products

13 products from 6 vendors

Vendors

Canonical Ltd., Red Hat, Inc., ООО «Ред Софт», Сообщество свободного программного обеспечения, Daniel Stenberg

Products

Ubuntu, Red Hat Enterprise Linux, JBoss Core Services, OpenShift Container Platform, РЕД ОС (запись в едином реестре российских программ №3751), Red Hat OpenShift Dev Spaces, Logging subsystem for Red Hat OpenShift, Red Hat Trusted Profile Analyzer, Confidential Compute Attestation, Debian GNU/Linux, Red Hat Enterprise Linux AI, Red Hat Hardened Images, cURL

Versions

14.04 LTS (Ubuntu), 6 (Red Hat Enterprise Linux), 7 (Red Hat Enterprise Linux), 16.04 LTS (Ubuntu), 18.04 LTS (Ubuntu), 8 (Red Hat Enterprise Linux), - (JBoss Core Services), 4 (OpenShift Container Platform), 20.04 LTS (Ubuntu), 7.3 (РЕД ОС), 22.04 LTS (Ubuntu), 9 (Red Hat Enterprise Linux), - (Red Hat OpenShift Dev Spaces), - (Logging subsystem for Red Hat OpenShift), 24.04 LTS (Ubuntu), 10 (Red Hat Enterprise Linux), - (Red Hat Trusted Profile Analyzer), - (Confidential Compute Attestation), 13 (Debian GNU/Linux), 8.0 (РЕД ОС), 3 (Red Hat Enterprise Linux AI), - (Red Hat Hardened Images), 26.04 LTS (Ubuntu), от 7.10.6 до 8.19.0 включительно (cURL)

Product types

Operating system, Application software

Platforms

Canonical Ltd. Ubuntu 14.04 LTS, Red Hat, Inc. Red Hat Enterprise Linux 6, Inc. Red Hat Enterprise Linux 7, Canonical Ltd. Ubuntu 16.04 LTS, Canonical Ltd. Ubuntu 18.04 LTS, Inc. Red Hat Enterprise Linux 8, Canonical Ltd. Ubuntu 20.04 LTS, ООО «Ред Софт» РЕД ОС 7.3 (запись в едином реестре российских программ №3751), Canonical Ltd. Ubuntu 22.04 LTS, Inc. Red Hat Enterprise Linux 9, Canonical Ltd. Ubuntu 24.04 LTS, Inc. Red Hat Enterprise Linux 10, Сообщество свободного программного обеспечения Debian GNU/Linux 13, ООО «Ред Софт» РЕД ОС 8.0 (запись в едином реестре российских программ №3751), Inc. Red Hat Enterprise Linux AI 3, Canonical Ltd. Ubuntu 26.04 LTS

Mitigations

Использование рекомендаций: Для cURL: https://curl.se/docs/CVE-2026-5545.html Для Ред ОС: https://redos.red-soft.ru/search/?iblock_id=24&q=CVE-2026-5545 Для Debian GNU/Linux: https://security-tracker.debian.org/tracker/CVE-2026-5545 Для Ubuntu: https://ubuntu.com/security/CVE-2026-5545 Для программных продуктов Red Hat Inc.: https://access.redhat.com/security/cve/cve-2026-5545

JSON

To clipboard

{
  "CVSS 2.0": "AV:N/AC:H/Au:N/C:P/I:C/A:N",
  "CVSS 3.0": "AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Canonical Ltd., Red Hat, Inc., \u041e\u041e\u041e \u00ab\u0420\u0435\u0434 \u0421\u043e\u0444\u0442\u00bb, \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f, Daniel Stenberg",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "14.04 LTS (Ubuntu), 6 (Red Hat Enterprise Linux), 7 (Red Hat Enterprise Linux), 16.04 LTS (Ubuntu), 18.04 LTS (Ubuntu), 8 (Red Hat Enterprise Linux), - (JBoss Core Services), 4 (OpenShift Container Platform), 20.04 LTS (Ubuntu), 7.3 (\u0420\u0415\u0414 \u041e\u0421), 22.04 LTS (Ubuntu), 9 (Red Hat Enterprise Linux), - (Red Hat OpenShift Dev Spaces), - (Logging subsystem for Red Hat OpenShift), 24.04 LTS (Ubuntu), 10 (Red Hat Enterprise Linux), - (Red Hat Trusted Profile Analyzer), - (Confidential Compute Attestation), 13 (Debian GNU/Linux), 8.0 (\u0420\u0415\u0414 \u041e\u0421), 3 (Red Hat Enterprise Linux AI), - (Red Hat Hardened Images), 26.04 LTS (Ubuntu), \u043e\u0442 7.10.6 \u0434\u043e 8.19.0 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (cURL)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\n\u0414\u043b\u044f cURL:\nhttps://curl.se/docs/CVE-2026-5545.html\n\n\u0414\u043b\u044f \u0420\u0435\u0434 \u041e\u0421:\nhttps://redos.red-soft.ru/search/?iblock_id=24\u0026q=CVE-2026-5545\n\n\u0414\u043b\u044f Debian GNU/Linux:\nhttps://security-tracker.debian.org/tracker/CVE-2026-5545\n\n\u0414\u043b\u044f Ubuntu:\nhttps://ubuntu.com/security/CVE-2026-5545\n\n\u0414\u043b\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 Red Hat Inc.:\nhttps://access.redhat.com/security/cve/cve-2026-5545",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "13.05.2026",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "15.07.2026",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "15.07.2026",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2026-09771",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2026-5545",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Ubuntu, Red Hat Enterprise Linux, JBoss Core Services, OpenShift Container Platform, \u0420\u0415\u0414 \u041e\u0421 (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u21163751), Red Hat OpenShift Dev Spaces, Logging subsystem for Red Hat OpenShift, Red Hat Trusted Profile Analyzer, Confidential Compute Attestation, Debian GNU/Linux, Red Hat Enterprise Linux AI, Red Hat Hardened Images, cURL",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": "Canonical Ltd. Ubuntu 14.04 LTS , Red Hat, Inc. Red Hat Enterprise Linux 6 , Red Hat, Inc. Red Hat Enterprise Linux 7 , Canonical Ltd. Ubuntu 16.04 LTS , Canonical Ltd. Ubuntu 18.04 LTS , Red Hat, Inc. Red Hat Enterprise Linux 8 , Canonical Ltd. Ubuntu 20.04 LTS , \u041e\u041e\u041e \u00ab\u0420\u0435\u0434 \u0421\u043e\u0444\u0442\u00bb \u0420\u0415\u0414 \u041e\u0421 7.3  (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u21163751), Canonical Ltd. Ubuntu 22.04 LTS , Red Hat, Inc. Red Hat Enterprise Linux 9 , Canonical Ltd. Ubuntu 24.04 LTS , Red Hat, Inc. Red Hat Enterprise Linux 10 , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Debian GNU/Linux 13 , \u041e\u041e\u041e \u00ab\u0420\u0435\u0434 \u0421\u043e\u0444\u0442\u00bb \u0420\u0415\u0414 \u041e\u0421 8.0  (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u21163751), Red Hat, Inc. Red Hat Enterprise Linux AI 3 , Canonical Ltd. Ubuntu 26.04 LTS ",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 cURL, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043d\u0435\u0432\u0435\u0440\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441\u0435\u0430\u043d\u0441\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u0435\u0441\u0430\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041d\u0435\u0432\u0435\u0440\u043d\u044b\u0439 \u0441\u0440\u043e\u043a \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441\u0435\u0430\u043d\u0441\u0430 (CWE-613)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 cURL \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043d\u0435\u0432\u0435\u0440\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441\u0435\u0430\u043d\u0441\u0430. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e, \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u0435\u0441\u0430\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u041c\u0430\u043d\u0438\u043f\u0443\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0440\u043e\u043a\u0430\u043c\u0438 \u0438 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://hackerone.com/reports/3642555\nhttps://github.com/advisories/GHSA-6g7g-56fm-f8mp\nhttps://curl.se/docs/CVE-2026-5545.html\nhttps://curl.se/docs/CVE-2026-5545.json\nhttps://redos.red-soft.ru/search/?iblock_id=24\u0026q=CVE-2026-5545\nhttps://security-tracker.debian.org/tracker/CVE-2026-5545\nhttps://access.redhat.com/security/cve/cve-2026-5545\nhttps://ubuntu.com/security/CVE-2026-5545",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430, \u041f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u043e\u0435 \u041f\u041e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-613",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 6,1)\n\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.1 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 6,5)"
}

CVE-2026-5545 (GCVE-0-2026-5545)

Vulnerability from cvelistv5 – Published: 2026-05-13 08:27 – Updated: 2026-09-15 06:02

Title

wrong reuse of HTTP Negotiate connection

Summary

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 17:46 UTC

CWE

CWE-305 - Authentication Bypass by Primary Weakness

Assigner

curl redhat root

References

3 references

URL	Tags
https://curl.se/docs/CVE-2026-5545.json
https://curl.se/docs/CVE-2026-5545.html
https://hackerone.com/reports/3642555

Impacted products

3 products

Vendor	Product	Version
curl	curl	Affected: 7.10.6 , < 8.14.2 (semver) Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.0 (semver)
curl	curl	Affected: e56ae1426cb7a0a4a427cf8d6099a821fdaae428 , < 33e43985b8f3b9e66691d06e70be0395849856cd (git)
curl	curl	Affected: 8.19.0 Affected: 8.18.0 Affected: 8.17.0 Affected: 8.16.0 Affected: 8.15.0 Affected: 8.14.1 Affected: 8.14.0 Affected: 8.13.0 Affected: 8.12.1 Affected: 8.12.0 Affected: 8.11.1 Affected: 8.11.0 Affected: 8.10.1 Affected: 8.10.0 Affected: 8.9.1 Affected: 8.9.0 Affected: 8.8.0 Affected: 8.7.1 Affected: 8.7.0 Affected: 8.6.0 Affected: 8.5.0 Affected: 8.4.0 Affected: 8.3.0 Affected: 8.2.1 Affected: 8.2.0 Affected: 8.1.2 Affected: 8.1.1 Affected: 8.1.0 Affected: 8.0.1 Affected: 8.0.0 Affected: 7.88.1 Affected: 7.88.0 Affected: 7.87.0 Affected: 7.86.0 Affected: 7.85.0 Affected: 7.84.0 Affected: 7.83.1 Affected: 7.83.0 Affected: 7.82.0 Affected: 7.81.0 Affected: 7.80.0 Affected: 7.79.1 Affected: 7.79.0 Affected: 7.78.0 Affected: 7.77.0 Affected: 7.76.1 Affected: 7.76.0 Affected: 7.75.0 Affected: 7.74.0 Affected: 7.73.0 Affected: 7.72.0 Affected: 7.71.1 Affected: 7.71.0 Affected: 7.70.0 Affected: 7.69.1 Affected: 7.69.0 Affected: 7.68.0 Affected: 7.67.0 Affected: 7.66.0 Affected: 7.65.3 Affected: 7.65.2 Affected: 7.65.1 Affected: 7.65.0 Affected: 7.64.1 Affected: 7.64.0 Affected: 7.63.0 Affected: 7.62.0 Affected: 7.61.1 Affected: 7.61.0 Affected: 7.60.0 Affected: 7.59.0 Affected: 7.58.0 Affected: 7.57.0 Affected: 7.56.1 Affected: 7.56.0 Affected: 7.55.1 Affected: 7.55.0 Affected: 7.54.1 Affected: 7.54.0 Affected: 7.53.1 Affected: 7.53.0 Affected: 7.52.1 Affected: 7.52.0 Affected: 7.51.0 Affected: 7.50.3 Affected: 7.50.2 Affected: 7.50.1 Affected: 7.50.0 Affected: 7.49.1 Affected: 7.49.0 Affected: 7.48.0 Affected: 7.47.1 Affected: 7.47.0 Affected: 7.46.0 Affected: 7.45.0 Affected: 7.44.0 Affected: 7.43.0 Affected: 7.42.1 Affected: 7.42.0 Affected: 7.41.0 Affected: 7.40.0 Affected: 7.39.0 Affected: 7.38.0 Affected: 7.37.1 Affected: 7.37.0 Affected: 7.36.0 Affected: 7.35.0 Affected: 7.34.0 Affected: 7.33.0 Affected: 7.32.0 Affected: 7.31.0 Affected: 7.30.0 Affected: 7.29.0 Affected: 7.28.1 Affected: 7.28.0 Affected: 7.27.0 Affected: 7.26.0 Affected: 7.25.0 Affected: 7.24.0 Affected: 7.23.1 Affected: 7.23.0 Affected: 7.22.0 Affected: 7.21.7 Affected: 7.21.6 Affected: 7.21.5 Affected: 7.21.4 Affected: 7.21.3 Affected: 7.21.2 Affected: 7.21.1 Affected: 7.21.0 Affected: 7.20.1 Affected: 7.20.0 Affected: 7.19.7 Affected: 7.19.6 Affected: 7.19.5 Affected: 7.19.4 Affected: 7.19.3 Affected: 7.19.2 Affected: 7.19.1 Affected: 7.19.0 Affected: 7.18.2 Affected: 7.18.1 Affected: 7.18.0 Affected: 7.17.1 Affected: 7.17.0 Affected: 7.16.4 Affected: 7.16.3 Affected: 7.16.2 Affected: 7.16.1 Affected: 7.16.0 Affected: 7.15.5 Affected: 7.15.4 Affected: 7.15.3 Affected: 7.15.2 Affected: 7.15.1 Affected: 7.15.0 Affected: 7.14.1 Affected: 7.14.0 Affected: 7.13.2 Affected: 7.13.1 Affected: 7.13.0 Affected: 7.12.3 Affected: 7.12.2 Affected: 7.12.1 Affected: 7.12.0 Affected: 7.11.2 Affected: 7.11.1 Affected: 7.11.0 Affected: 7.10.8 Affected: 7.10.7 Affected: 7.10.6

Credits

Quac Tran and Ngoc Hieu Stefan Eissing

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-5545",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T17:46:36.115262Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T17:46:40.830Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackerone.com/reports/3642555"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "8.14.2",
              "status": "affected",
              "version": "7.10.6",
              "versionType": "semver"
            },
            {
              "lessThan": "8.16.1",
              "status": "affected",
              "version": "8.15.0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.20.0",
              "status": "affected",
              "version": "8.17.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "repo": "https://github.com/curl/curl.git",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "33e43985b8f3b9e66691d06e70be0395849856cd",
              "status": "affected",
              "version": "e56ae1426cb7a0a4a427cf8d6099a821fdaae428",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "status": "affected",
              "version": "8.19.0"
            },
            {
              "status": "affected",
              "version": "8.18.0"
            },
            {
              "status": "affected",
              "version": "8.17.0"
            },
            {
              "status": "affected",
              "version": "8.16.0"
            },
            {
              "status": "affected",
              "version": "8.15.0"
            },
            {
              "status": "affected",
              "version": "8.14.1"
            },
            {
              "status": "affected",
              "version": "8.14.0"
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            {
              "status": "affected",
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              "status": "affected",
              "version": "8.12.1"
            },
            {
              "status": "affected",
              "version": "8.12.0"
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            {
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              "status": "affected",
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              "status": "affected",
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              "version": "8.9.0"
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            {
              "status": "affected",
              "version": "8.7.1"
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            {
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            {
              "status": "affected",
              "version": "8.0.0"
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            {
              "status": "affected",
              "version": "7.86.0"
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            {
              "status": "affected",
              "version": "7.85.0"
            },
            {
              "status": "affected",
              "version": "7.84.0"
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            {
              "status": "affected",
              "version": "7.83.1"
            },
            {
              "status": "affected",
              "version": "7.83.0"
            },
            {
              "status": "affected",
              "version": "7.82.0"
            },
            {
              "status": "affected",
              "version": "7.81.0"
            },
            {
              "status": "affected",
              "version": "7.80.0"
            },
            {
              "status": "affected",
              "version": "7.79.1"
            },
            {
              "status": "affected",
              "version": "7.79.0"
            },
            {
              "status": "affected",
              "version": "7.78.0"
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            {
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              "version": "7.77.0"
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            {
              "status": "affected",
              "version": "7.76.1"
            },
            {
              "status": "affected",
              "version": "7.76.0"
            },
            {
              "status": "affected",
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              "version": "7.64.1"
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              "status": "affected",
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              "status": "affected",
              "version": "7.63.0"
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            {
              "status": "affected",
              "version": "7.62.0"
            },
            {
              "status": "affected",
              "version": "7.61.1"
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            {
              "status": "affected",
              "version": "7.61.0"
            },
            {
              "status": "affected",
              "version": "7.60.0"
            },
            {
              "status": "affected",
              "version": "7.59.0"
            },
            {
              "status": "affected",
              "version": "7.58.0"
            },
            {
              "status": "affected",
              "version": "7.57.0"
            },
            {
              "status": "affected",
              "version": "7.56.1"
            },
            {
              "status": "affected",
              "version": "7.56.0"
            },
            {
              "status": "affected",
              "version": "7.55.1"
            },
            {
              "status": "affected",
              "version": "7.55.0"
            },
            {
              "status": "affected",
              "version": "7.54.1"
            },
            {
              "status": "affected",
              "version": "7.54.0"
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            {
              "status": "affected",
              "version": "7.53.1"
            },
            {
              "status": "affected",
              "version": "7.53.0"
            },
            {
              "status": "affected",
              "version": "7.52.1"
            },
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              "status": "affected",
              "version": "7.52.0"
            },
            {
              "status": "affected",
              "version": "7.51.0"
            },
            {
              "status": "affected",
              "version": "7.50.3"
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              "version": "7.50.2"
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              "status": "affected",
              "version": "7.50.1"
            },
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              "status": "affected",
              "version": "7.50.0"
            },
            {
              "status": "affected",
              "version": "7.49.1"
            },
            {
              "status": "affected",
              "version": "7.49.0"
            },
            {
              "status": "affected",
              "version": "7.48.0"
            },
            {
              "status": "affected",
              "version": "7.47.1"
            },
            {
              "status": "affected",
              "version": "7.47.0"
            },
            {
              "status": "affected",
              "version": "7.46.0"
            },
            {
              "status": "affected",
              "version": "7.45.0"
            },
            {
              "status": "affected",
              "version": "7.44.0"
            },
            {
              "status": "affected",
              "version": "7.43.0"
            },
            {
              "status": "affected",
              "version": "7.42.1"
            },
            {
              "status": "affected",
              "version": "7.42.0"
            },
            {
              "status": "affected",
              "version": "7.41.0"
            },
            {
              "status": "affected",
              "version": "7.40.0"
            },
            {
              "status": "affected",
              "version": "7.39.0"
            },
            {
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            },
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            },
            {
              "status": "affected",
              "version": "7.37.0"
            },
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              "version": "7.36.0"
            },
            {
              "status": "affected",
              "version": "7.35.0"
            },
            {
              "status": "affected",
              "version": "7.34.0"
            },
            {
              "status": "affected",
              "version": "7.33.0"
            },
            {
              "status": "affected",
              "version": "7.32.0"
            },
            {
              "status": "affected",
              "version": "7.31.0"
            },
            {
              "status": "affected",
              "version": "7.30.0"
            },
            {
              "status": "affected",
              "version": "7.29.0"
            },
            {
              "status": "affected",
              "version": "7.28.1"
            },
            {
              "status": "affected",
              "version": "7.28.0"
            },
            {
              "status": "affected",
              "version": "7.27.0"
            },
            {
              "status": "affected",
              "version": "7.26.0"
            },
            {
              "status": "affected",
              "version": "7.25.0"
            },
            {
              "status": "affected",
              "version": "7.24.0"
            },
            {
              "status": "affected",
              "version": "7.23.1"
            },
            {
              "status": "affected",
              "version": "7.23.0"
            },
            {
              "status": "affected",
              "version": "7.22.0"
            },
            {
              "status": "affected",
              "version": "7.21.7"
            },
            {
              "status": "affected",
              "version": "7.21.6"
            },
            {
              "status": "affected",
              "version": "7.21.5"
            },
            {
              "status": "affected",
              "version": "7.21.4"
            },
            {
              "status": "affected",
              "version": "7.21.3"
            },
            {
              "status": "affected",
              "version": "7.21.2"
            },
            {
              "status": "affected",
              "version": "7.21.1"
            },
            {
              "status": "affected",
              "version": "7.21.0"
            },
            {
              "status": "affected",
              "version": "7.20.1"
            },
            {
              "status": "affected",
              "version": "7.20.0"
            },
            {
              "status": "affected",
              "version": "7.19.7"
            },
            {
              "status": "affected",
              "version": "7.19.6"
            },
            {
              "status": "affected",
              "version": "7.19.5"
            },
            {
              "status": "affected",
              "version": "7.19.4"
            },
            {
              "status": "affected",
              "version": "7.19.3"
            },
            {
              "status": "affected",
              "version": "7.19.2"
            },
            {
              "status": "affected",
              "version": "7.19.1"
            },
            {
              "status": "affected",
              "version": "7.19.0"
            },
            {
              "status": "affected",
              "version": "7.18.2"
            },
            {
              "status": "affected",
              "version": "7.18.1"
            },
            {
              "status": "affected",
              "version": "7.18.0"
            },
            {
              "status": "affected",
              "version": "7.17.1"
            },
            {
              "status": "affected",
              "version": "7.17.0"
            },
            {
              "status": "affected",
              "version": "7.16.4"
            },
            {
              "status": "affected",
              "version": "7.16.3"
            },
            {
              "status": "affected",
              "version": "7.16.2"
            },
            {
              "status": "affected",
              "version": "7.16.1"
            },
            {
              "status": "affected",
              "version": "7.16.0"
            },
            {
              "status": "affected",
              "version": "7.15.5"
            },
            {
              "status": "affected",
              "version": "7.15.4"
            },
            {
              "status": "affected",
              "version": "7.15.3"
            },
            {
              "status": "affected",
              "version": "7.15.2"
            },
            {
              "status": "affected",
              "version": "7.15.1"
            },
            {
              "status": "affected",
              "version": "7.15.0"
            },
            {
              "status": "affected",
              "version": "7.14.1"
            },
            {
              "status": "affected",
              "version": "7.14.0"
            },
            {
              "status": "affected",
              "version": "7.13.2"
            },
            {
              "status": "affected",
              "version": "7.13.1"
            },
            {
              "status": "affected",
              "version": "7.13.0"
            },
            {
              "status": "affected",
              "version": "7.12.3"
            },
            {
              "status": "affected",
              "version": "7.12.2"
            },
            {
              "status": "affected",
              "version": "7.12.1"
            },
            {
              "status": "affected",
              "version": "7.12.0"
            },
            {
              "status": "affected",
              "version": "7.11.2"
            },
            {
              "status": "affected",
              "version": "7.11.1"
            },
            {
              "status": "affected",
              "version": "7.11.0"
            },
            {
              "status": "affected",
              "version": "7.10.8"
            },
            {
              "status": "affected",
              "version": "7.10.7"
            },
            {
              "status": "affected",
              "version": "7.10.6"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Quac Tran and Ngoc Hieu"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stefan Eissing"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0027s and user2\u0027s credentials when it is in fact\nstill using the connection authenticated for user1..."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-305",
              "description": "Authentication Bypass by Primary Weakness",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T06:02:59.285Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2026-5545.json"
        },
        {
          "url": "https://curl.se/docs/CVE-2026-5545.html"
        },
        {
          "url": "https://hackerone.com/reports/3642555"
        }
      ],
      "title": "wrong reuse of HTTP Negotiate connection",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_osv": {
        "affected": [
          {
            "ranges": [
              {
                "events": [
                  {
                    "introduced": "7.10.6"
                  },
                  {
                    "fixed": "8.14.2"
                  },
                  {
                    "introduced": "8.15.0"
                  },
                  {
                    "fixed": "8.16.1"
                  },
                  {
                    "introduced": "8.17.0"
                  },
                  {
                    "fixed": "8.20.0"
                  }
                ],
                "type": "SEMVER"
              },
              {
                "events": [
                  {
                    "introduced": "e56ae1426cb7a0a4a427cf8d6099a821fdaae428"
                  },
                  {
                    "fixed": "33e43985b8f3b9e66691d06e70be0395849856cd"
                  }
                ],
                "repo": "https://github.com/curl/curl.git",
                "type": "GIT"
              }
            ],
            "versions": [
              "8.19.0",
              "8.18.0",
              "8.17.0",
              "8.16.0",
              "8.15.0",
              "8.14.1",
              "8.14.0",
              "8.13.0",
              "8.12.1",
              "8.12.0",
              "8.11.1",
              "8.11.0",
              "8.10.1",
              "8.10.0",
              "8.9.1",
              "8.9.0",
              "8.8.0",
              "8.7.1",
              "8.7.0",
              "8.6.0",
              "8.5.0",
              "8.4.0",
              "8.3.0",
              "8.2.1",
              "8.2.0",
              "8.1.2",
              "8.1.1",
              "8.1.0",
              "8.0.1",
              "8.0.0",
              "7.88.1",
              "7.88.0",
              "7.87.0",
              "7.86.0",
              "7.85.0",
              "7.84.0",
              "7.83.1",
              "7.83.0",
              "7.82.0",
              "7.81.0",
              "7.80.0",
              "7.79.1",
              "7.79.0",
              "7.78.0",
              "7.77.0",
              "7.76.1",
              "7.76.0",
              "7.75.0",
              "7.74.0",
              "7.73.0",
              "7.72.0",
              "7.71.1",
              "7.71.0",
              "7.70.0",
              "7.69.1",
              "7.69.0",
              "7.68.0",
              "7.67.0",
              "7.66.0",
              "7.65.3",
              "7.65.2",
              "7.65.1",
              "7.65.0",
              "7.64.1",
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              "7.61.0",
              "7.60.0",
              "7.59.0",
              "7.58.0",
              "7.57.0",
              "7.56.1",
              "7.56.0",
              "7.55.1",
              "7.55.0",
              "7.54.1",
              "7.54.0",
              "7.53.1",
              "7.53.0",
              "7.52.1",
              "7.52.0",
              "7.51.0",
              "7.50.3",
              "7.50.2",
              "7.50.1",
              "7.50.0",
              "7.49.1",
              "7.49.0",
              "7.48.0",
              "7.47.1",
              "7.47.0",
              "7.46.0",
              "7.45.0",
              "7.44.0",
              "7.43.0",
              "7.42.1",
              "7.42.0",
              "7.41.0",
              "7.40.0",
              "7.39.0",
              "7.38.0",
              "7.37.1",
              "7.37.0",
              "7.36.0",
              "7.35.0",
              "7.34.0",
              "7.33.0",
              "7.32.0",
              "7.31.0",
              "7.30.0",
              "7.29.0",
              "7.28.1",
              "7.28.0",
              "7.27.0",
              "7.26.0",
              "7.25.0",
              "7.24.0",
              "7.23.1",
              "7.23.0",
              "7.22.0",
              "7.21.7",
              "7.21.6",
              "7.21.5",
              "7.21.4",
              "7.21.3",
              "7.21.2",
              "7.21.1",
              "7.21.0",
              "7.20.1",
              "7.20.0",
              "7.19.7",
              "7.19.6",
              "7.19.5",
              "7.19.4",
              "7.19.3",
              "7.19.2",
              "7.19.1",
              "7.19.0",
              "7.18.2",
              "7.18.1",
              "7.18.0",
              "7.17.1",
              "7.17.0",
              "7.16.4",
              "7.16.3",
              "7.16.2",
              "7.16.1",
              "7.16.0",
              "7.15.5",
              "7.15.4",
              "7.15.3",
              "7.15.2",
              "7.15.1",
              "7.15.0",
              "7.14.1",
              "7.14.0",
              "7.13.2",
              "7.13.1",
              "7.13.0",
              "7.12.3",
              "7.12.2",
              "7.12.1",
              "7.12.0",
              "7.11.2",
              "7.11.1",
              "7.11.0",
              "7.10.8",
              "7.10.7",
              "7.10.6"
            ]
          }
        ],
        "aliases": [
          "CVE-2026-5545"
        ],
        "credits": [
          {
            "name": "Quac Tran and Ngoc Hieu",
            "type": "finder"
          },
          {
            "name": "Stefan Eissing",
            "type": "remediation developer"
          }
        ],
        "database_specific": {
          "CWE": {
            "desc": "Authentication Bypass by Primary Weakness",
            "id": "CWE-305"
          },
          "URL": "https://curl.se/docs/CVE-2026-5545.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3642555",
          "last_affected": "8.19.0",
          "package": "curl",
          "severity": "Medium",
          "www": "https://curl.se/docs/CVE-2026-5545.html"
        },
        "details": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0027s and user2\u0027s credentials when it is in fact\nstill using the connection authenticated for user1...",
        "id": "CURL-CVE-2026-5545",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-04-29T08:00:00.00Z",
        "schema_version": "1.5.0",
        "summary": "wrong reuse of HTTP Negotiate connection"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-5545",
    "datePublished": "2026-05-13T08:27:26.065Z",
    "dateReserved": "2026-04-04T12:10:07.125Z",
    "dateUpdated": "2026-09-15T06:02:59.285Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.