CVE catalog
CVE-2026-71326
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent passwo
- Severity
- Low · CVSS 3.8
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
A flaw was found in Traefik. The BasicAuth middleware in Traefik reuses a key for concurrent password checks, which is generated by concatenating the password and secret without a delimiter. An attacker with a valid credential and the corresponding stored hash can exploit this vulnerability to authenticate as an unconfigured username. This identity spoofing is possible when the 'headerField' is configured to trust forwarded identity information. github.com/traefik/traefik: Traefik: Authenticated identity spoofing via BasicAuth key collision Red Hat OpenShift Dev Spaces bundles Traefik as a reverse proxy component. The shipped Traefik versions (3.27.1, 3.28.2, 3.29) are newer than the versions affected by this flaw (3.6.11-3.6.25 and 3.7.0-3.7.10), which are already fixed in the shipped releases. No Red Hat product is affected. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Go | github.com/traefik/traefik/v3 | Not reported | 3.6.25 | fixed |
| Go | github.com/traefik/traefik/v3 | Not reported | 3.7.10 | fixed |
| Cpe | traefik | Not reported | 3.7.10 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Go | github.com/traefik/traefik/v3 | go | Not reported | 3.6.25 | Not reported | Not reported | Not reported |
| Go | github.com/traefik/traefik/v3 | go | Not reported | 3.7.10 | Not reported | Not reported | Not reported |
| Cpe | traefik | cpe | Not reported | 3.7.10 | Not reported | NVD-CVE-2026-71326 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/advisories/GHSA-6765-c87h-8mrf]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-71326]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71326.json]
[FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]