HTTP Reverse Proxy Vulnerability in Traefik Affecting Multiple Versions
CVE-2026-29054

7.5HIGH

Key Information:

Vendor

Traefik

Status
Traefik
Vendor
CVE Published:
5 March 2026

What is CVE-2026-29054?

Traefik, an HTTP reverse proxy and load balancer, has a vulnerability within the management of the Connection header in conjunction with X-Forwarded headers. The flaw arises in how Traefik processes HTTP/1.1 requests; the comparison of Connection tokens against protected header names is case-sensitive, yet their deletion occurs in a case-insensitive manner. This discrepancy allows a remote unauthenticated attacker to exploit the issue by issuing HTTP requests with lowercase Connection tokens, effectively bypassing protections that safeguard Traefik-managed headers like X-Real-Ip and X-Forwarded-Host. It is crucial for users running affected versions to update to patched versions 2.11.38 or 3.6.9 to mitigate this risk.

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Affected Version(s)

traefik >= 2.11.9, < 2.11.38 < 2.11.9, 2.11.38

traefik >= 3.1.3, < 3.6.9 < 3.1.3, 3.6.9

References

https://github.com/traefik/traefik/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/traefik/traefik/releases/tag/v2.11.38
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v3.6.9
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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