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Vulnerability record · CVE-2026-88009 · published 10 September 2026

CVE-2026-88009: Traefik http request smuggling vulnerability

Traefik · Traefik

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.

8.8 CVSS 4.0 High EPSS 0.44% · top 63.9% CWE-444 · HTTP request smugglingCWE-1286 · CWE-1286
8.8CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
14 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9 Patch
https://github.com/traefik/traefik/pull/13796 Issue TrackingPatch
https://github.com/traefik/traefik/releases/tag/v2.11.57 Release Notes
https://github.com/traefik/traefik/releases/tag/v3.7.13 Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-88009), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.