Vulnerability-Lookup

OPENSUSE-SU-2026:11243-1

Vulnerability from csaf_opensuse - Published: 2026-07-09 00:00 - Updated: 2026-09-16 21:21

Summary

traefik2-2.11.52-1.1 on GA media

Severity

Moderate

Notes

Title of the patch: traefik2-2.11.52-1.1 on GA media

Description of the patch: These are all security issues fixed in the traefik2-2.11.52-1.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-11243

CVE-2026-54763

7.5 (High)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:traefik2-2.11.52-1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-2.11.52-1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-2.11.52-1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-2.11.52-1.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-54764

5.3 (Medium)


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

Affected products

Recommended 4 products, the same list as for CVE-2026-54763

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2026-54763/	self
https://www.suse.com/security/cve/CVE-2026-54764/	self
https://www.suse.com/security/cve/CVE-2026-54763	external
https://bugzilla.suse.com/1270430	external
https://www.suse.com/security/cve/CVE-2026-54764	external
https://bugzilla.suse.com/1270432	external

JSON

To clipboard

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}

CVE-2026-54763 (GCVE-0-2026-54763)

Vulnerability from cvelistv5 – Published: 2026-07-06 20:33 – Updated: 2026-07-08 19:42

Title

Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

Severity

7.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 17:13 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity
CWE-290 - Authentication Bypass by Spoofing
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/traefik/traefik/security/advis…	x_refsource_CONFIRM
https://github.com/traefik/traefik/pull/13262	x_refsource_MISC
https://github.com/traefik/traefik/commit/108a526…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
traefik	traefik	Affected: < 2.11.51 Affected: >= 3.0.0-beta1, < 3.6.22 Affected: >= 3.7.0-ea.1, < 3.7.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-54763",
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        },
        {
          "name": "https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b"
        }
      ],
      "source": {
        "advisory": "GHSA-x677-9fxg-v5c5",
        "discovery": "UNKNOWN"
      },
      "title": "Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54763",
    "datePublished": "2026-07-06T20:33:36.059Z",
    "dateReserved": "2026-06-15T23:12:41.966Z",
    "dateUpdated": "2026-07-08T19:42:06.759Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-54764 (GCVE-0-2026-54764)

Vulnerability from cvelistv5 – Published: 2026-07-06 20:20 – Updated: 2026-07-07 14:03

Title

ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-07 14:03 UTC

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/traefik/traefik/security/advis…	x_refsource_CONFIRM
https://github.com/traefik/traefik/pull/13344	x_refsource_MISC
https://github.com/traefik/traefik/commit/7ae92d8…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
traefik	traefik	Affected: < 2.11.51 Affected: >= 3.0.0, < 3.6.22 Affected: >= 3.7.0, < 3.7.6

Show details on NVD website

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{
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                "id": "CVE-2026-54764",
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-07-07T14:03:07.994154Z",
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          "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik\u0027s ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6."
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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.

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Action not permitted

OPENSUSE-SU-2026:11243-1

CVE-2026-54763 (GCVE-0-2026-54763)

CVE-2026-54764 (GCVE-0-2026-54764)

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