Traefik affected by TLS ClientAuth Bypass on HTTP/3

published 2026-02-20 8mo ago modified 2026-03-13 8mo ago also GO-2026-4530

cvss: 10.0; version 3.1, GitHub
cisa kev: Not listed; not in CISA's catalog
epss: —; no score, EPSS covers CVEs only
public exploits: 0; none known

### Summary

There is a potential vulnerability in Traefik managing HTTP/3 connections.

More details in the [CVE-2025-68121](https://nvd.nist.gov/vuln/detail/CVE-2025-68121).

## Patches

- https://github.com/traefik/traefik/releases/tag/v2.11.37 - https://github.com/traefik/traefik/releases/tag/v3.6.8

## Workarounds

No workaround

## For more information

If you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).

Patch / fix

fixed in 2

go github.com/traefik/traefik/v2 2.11.37
go github.com/traefik/traefik/v3 3.6.8

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CVSS scores

assigned by	version	score	vector
GitHub	3.1	10.0	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/traefik/traefik	<=1.7.34 all versions	no fix listed
go	github.com/traefik/traefik/v2	<2.11.37	2.11.37
go	github.com/traefik/traefik/v3	<3.6.8	3.6.8

Classification

Weakness

CWE-1395 Dependency on Vulnerable Third-Party Component

References

github.com /traefik/traefik/security/advisories/GHSA-gv8r-9rw9-9697
web, advisory
github.com /traefik/traefik
package

Sources

GitHub Advisory GHSA-gv8r-9rw9-9697
OSV GO-2026-4530

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