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Traefik affected by TLS ClientAuth Bypass on HTTP/3GHSA-gv8r-9rw9-9697

CRITICAL

GHSA-gv8r-9rw9-9697 is a critical-severity (CVSS 10) vulnerability in github.com/traefik/traefik. A fix is available for github.com/traefik/traefik — see the affected versions and patch details below.

Also known asGO-2026-4530
Published
Updated
Affected
3 pkgs
Patched
2 / 3
Exploits
None indexed
Exploitation data as of Mar 13, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

3 pkgs affected
🐹github.com/traefik/traefik🐹github.com/traefik/traefik/v2🐹github.com/traefik/traefik/v3

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Summary

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

More details in the CVE-2025-68121.

Patches

Workarounds

No workaround

For more information

If you have any questions or comments about this advisory, please open an issue.

Affected Packages

3 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/traefik/traefikall versionsNo fix
🐹Gogithub.com/traefik/traefik/v2all versions2.11.37go get github.com/traefik/traefik/v2@v2.11.37
🐹Gogithub.com/traefik/traefik/v3all versions3.6.8go get github.com/traefik/traefik/v3@v3.6.8

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/traefik/traefik, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    A fix is available for GHSA-gv8r-9rw9-9697; check the affected-versions list above or the advisory for the patched release of github.com/traefik/traefik, then make sure no transitive dependency still pins the vulnerable range.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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).
O3 Security · Impact-Aware SCA

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Traefik affected by TLS ClientAuth Bypass on HTTP/3