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CVE-2026-88004

7.4 · HIGH

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

Published Sep 10, 2026traefikCWE-436EPSS 0.45%

Overview

CVE-2026-88004 is a high-severity vulnerability affecting traefik traefik. It was published on September 10, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. 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 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted header name in an HTTP/1.1 chunked trailer or an HTTP/2 trailer. When the retry or buffering middleware reads the body before the reverse proxy clones the request, the attacker-controlled trailer value reaches a backend that merges trailers into the header namespace, bypassing the documented delete or reject behavior and potentially spoofing identity or forwarded routing data. This issue is fixed in 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>= 3.2.0, < 3.7.13Affected

References

GitHubgithub.com/traefik/traefik/commit/55bbda4f65e0f9c533c870983a767a7081126db7GitHubgithub.com/traefik/traefik/pull/13822GitHubgithub.com/traefik/traefik/releases/tag/v3.7.13GitHubgithub.com/traefik/traefik/security/advisories/GHSA-v67p-phpq-fc8x

How CyberStrike helps

Frequently asked questions

What is CVE-2026-88004?

CVE-2026-88004 is a high-severity vulnerability affecting traefik traefik. It was published on September 10, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-88004?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-88004?

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-2026-88004?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-88004 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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