traefik CVE-2024-45410 fix bypass: lowercase Connection tokens can delete traefik-managed forwarded identity headers (for example, X-Real-Ip)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-29054: 0.53% estimated exploitation activity in the next 30 days; percentile 44.89 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact There is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This is a bypass of the fix for CVE-2024-45410. Depending on the deployment, the impact may be higher if downstream services rely on these headers (such as X-Real-Ip or X-Forwarded-) for authentication, authorization, routing, or scheme decisions. Patches -…

Published by the source

4 Mar 2026, 21:19 UTC

Last modified by the source

5 Mar 2026, 22:37 UTC

Source last checked

26 Oct 2026, 15:15 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-92mv-8f8w-wq52

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# Patch Next advisory brief: CVE-2026-29054

Advisory: traefik CVE-2024-45410 fix bypass: lowercase `Connection` tokens can delete traefik-managed forwarded identity headers (for example, `X-Real-Ip`)
IDs: CVE-2026-29054, GHSA-92mv-8f8w-wq52
Record: https://patchnext.com/advisories/cve-2026-29054 (revision 1, source checked 26 Oct 2026, 15:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/traefik/traefik/v3 3.6.9; github.com/traefik/traefik/v2 2.11.38. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/traefik/traefik/v3: affected >= 3.1.3, <= 3.6.8; fixed in 3.6.9
- Go github.com/traefik/traefik/v2: affected >= 2.11.9, <= 2.11.37; fixed in 2.11.38

## Suggested inspection (read-only)
- Go github.com/traefik/traefik/v3: check the installed version with your package manager.
- Go github.com/traefik/traefik/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/traefik/traefik/v3, github.com/traefik/traefik/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-92mv-8f8w-wq52 (GitHub-reviewed advisory GHSA-92mv-8f8w-wq52 lists affected ranges: Go github.com/traefik/traefik/v2 >=2.11.9 =3.1.3 <=3.6.8)

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