Critical [CVE-2026-65600] Authentication bypass via path traversal in ReplacePathRegex middleware
This critical-severity Red Hat Linux advisory covers CVE-2026-65600 affecting Red Hat OpenShift Dev Spaces 3.30.
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Summary
Traefik versions = v3.6.0 = v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware.
When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g.
GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.
A flaw was found in Traefik. When this middleware is misconfigured, it forwards un-normalized paths, allowing a backend to resolve them to protected routes and grant unauthorized access.
This bypass enables access to sensitive administrative interfaces. This Critical flaw in Traefik's `ReplacePathRegex` middleware allows an unauthenticated remote attacker to bypass authentication.
The impact to OpenShift Dev Spaces is rated as low, because the affected `ReplacePathRegex` middleware is not configured in the shipped Traefik gateway. Red Hat severity: Critical — CVSS 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N).
Weakness: CWE-22.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- 11.52
- 6.23
- devspaces/traefik-rhel9:1787756799
- RHSA-2026:62260
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation
Upgrade to a fixed release: 11.52, 6.23, devspaces/traefik-rhel9:1787756799, RHSA-2026:62260. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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