Vulnerability-Lookup

CVE-2026-75870 (GCVE-0-2026-75870)

Vulnerability from cvelistv5 – Published: 2026-08-22 13:35 – Updated: 2026-08-25 19:28

Title

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret

Summary

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie read and the write-back both default that key to the empty string, so a declaration with no secret option, or with an undefined or empty one, signs and verifies with a zero-length HMAC-SHA256 key. An attacker who knows the cookie format can then mint one offline carrying any contents the session holds, such as a user identifier or a role. Nothing marks the misconfiguration at runtime: cookies are well formed and sessions round-trip as expected.

Severity

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 19:27 UTC

CWE

CWE-1394 - Use of Default Cryptographic Key

Assigner

CPANSec redhat root

References

4 references

URL	Tags
https://metacpan.org/release/LNATION/Punk-0.17/so…	technical-description
https://metacpan.org/release/LNATION/Punk-0.17/vi…	technical-description
https://metacpan.org/release/LNATION/Punk-0.18/so…	release-notes
http://www.openwall.com/lists/oss-security/2026/08/22/5

Impacted products

1 product

Vendor	Product	Version	CPE status
		Affected: 0 , < 0.18 (custom)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-75870

Vulnerability from fkie_nvd - Published: 2026-08-22 14:16 - Updated: 2026-08-26 16:51

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/LNATION/Punk-0.17/source/include/punk/punk_session.h
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/LNATION/Punk-0.17/view/lib/Punk.pm
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/LNATION/Punk-0.18/source/Changes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/08/22/5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-3679-XR9W-9625

Vulnerability from github – Published: 2026-08-22 15:31 – Updated: 2026-08-25 21:31

Details

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret.

The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie read and the write-back both default that key to the empty string, so a declaration with no secret option, or with an undefined or empty one, signs and verifies with a zero-length HMAC-SHA256 key.

An attacker who knows the cookie format can then mint one offline carrying any contents the session holds, such as a user identifier or a role. Nothing marks the misconfiguration at runtime: cookies are well formed and sessions round-trip as expected.

Severity

9.1 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-75870"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1394"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T14:16:33Z",
    "severity": "CRITICAL"
  },
  "details": "Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret.\n\nThe session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie read and the write-back both default that key to the empty string, so a declaration with no secret option, or with an undefined or empty one, signs and verifies with a zero-length HMAC-SHA256 key.\n\nAn attacker who knows the cookie format can then mint one offline carrying any contents the session holds, such as a user identifier or a role. Nothing marks the misconfiguration at runtime: cookies are well formed and sessions round-trip as expected.",
  "id": "GHSA-3679-xr9w-9625",
  "modified": "2026-08-25T21:31:21Z",
  "published": "2026-08-22T15:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75870"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/LNATION/Punk-0.17/source/include/punk/punk_session.h"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/LNATION/Punk-0.17/view/lib/Punk.pm"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/LNATION/Punk-0.18/source/Changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/22/5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Action not permitted

CVE-2026-75870 (GCVE-0-2026-75870)

FKIE_CVE-2026-75870

GHSA-3679-XR9W-9625

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Sightings

Nomenclature

Related by attack behaviour