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CVE-2026-88008

9.1 · CRITICAL

Traefik is an open source HTTP reverse proxy and load balancer.

Published Sep 10, 2026traefikCWE-444EPSS 0.49%

Overview

CVE-2026-88008 is a critical-severity vulnerability affecting traefik traefik. It was published on September 10, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols, Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit, access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and 3.7.13.

Remediation

Check the references section for vendor advisories and patches from traefik. Update traefik to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
traefiktraefik>= 2.11.26, < 2.11.57Affected

References

GitHubgithub.com/traefik/traefik/commit/a277e94664ffc1ce9543df552d3bbf48d4d3b8b3GitHubgithub.com/traefik/traefik/pull/13797GitHubgithub.com/traefik/traefik/releases/tag/v2.11.57GitHubgithub.com/traefik/traefik/releases/tag/v3.7.13GitHubgithub.com/traefik/traefik/security/advisories/GHSA-w4v4-9rw7-5326

How CyberStrike helps

Frequently asked questions

What is CVE-2026-88008?

CVE-2026-88008 is a critical-severity vulnerability affecting traefik traefik. It was published on September 10, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-88008?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-88008?

Check the references section for vendor advisories and patches from traefik. Update traefik to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-88008?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-88008 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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