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CVE-2026-88009 Details

Description

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9	[email protected]	Patch
https://github.com/traefik/traefik/pull/13796	[email protected]	Issue TrackingPatch
https://github.com/traefik/traefik/releases/tag/v2.11.57	[email protected]	Release Notes
https://github.com/traefik/traefik/releases/tag/v3.7.13	[email protected]	Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724	[email protected]	PatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1286	Improper Validation of Syntactic Correctness of Input	[email protected]
CWE-444	Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')	[email protected]

Affected Products

Product	Versions
traefik traefik	< 2.11.57 >= 3.0.0, < 3.7.13
CPE cpe:2.3:a:traefik:traefik:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 14, 2026	Initial Analysis	[email protected]
Sep 10, 2026	New CVE Received	[email protected]
Sep 10, 2026	CVE Modified	CISA-ADP