CVE-2026-67309
published 2026-08-01CVE-2026-67309: Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated…
PriorityP352high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.66%
50.9th percentile
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication bypass. The issue is fixed in v3.7.8.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | traefik_traefik_v3 | >= 3.7.0 < 3.7.8 | 3.7.8 |
| traefik | traefik | >= 3.7.0 < 3.7.8 | 3.7.8 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvdv4.07.8HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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:X/V:X/RE:X/U:X
vendor_redhat7.8HIGH
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GHSA
Traefik: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass
ghsa·2026-08-06
CVE-2026-67309 [HIGH] CWE-22 Traefik: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass
Traefik: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass
## Summary
There is a high severity vulnerability in Traefik's Kubernetes Ingress NGINX provider. When an Ingress uses the `nginx.ingress.kubernetes.io/rewrite-target` annotation with a regular expression that captures attacker-controlled text without requiring a path separator (for example path `/api(.*)` with rewrite target `/$1`), the generated `RewriteTarget` middleware can turn an initially safe request path into a dot-segment traversal path after the router has already been selected.
## Patches
- https://github.com/traefik/traefik/releases/tag/v3.7.8
## For more information
If you have any questions or comments about this advisory, please [open an issue](https://github.com/tr
VulDB
Traefik up to 3.7.7 RewriteTarget Middleware path traversal (EUVD-2026-51815)
vuldb·2026-08-01·CVSS 7.8
CVE-2026-67309 [HIGH] Traefik up to 3.7.7 RewriteTarget Middleware path traversal (EUVD-2026-51815)
A vulnerability identified as critical has been detected in Traefik up to 3.7.7. Affected by this vulnerability is an unknown functionality of the component RewriteTarget Middleware. Performing a manipulation results in path traversal.
This vulnerability is known as CVE-2026-67309. Remote exploitation of the attack is possible. No exploit is available.
You should upgrade the affected component.
GHSA
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewr
ghsa_unreviewed·2026-08-01
CVE-2026-67309 [HIGH] CWE-22 Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewr
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication
Red Hat
github.com/traefik/traefik: Traefik: Authentication bypass via path traversal in RewriteTarget middleware
vendor_redhat·2026-08-01·CVSS 7.8
CVE-2026-67309 [HIGH] CWE-22 github.com/traefik/traefik: Traefik: Authentication bypass via path traversal in RewriteTarget middleware
github.com/traefik/traefik: Traefik: Authentication bypass via path traversal in RewriteTarget middleware
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a s
No detection rules found.
No public exploits indexed.
https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass
2026-08-01
Published