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TI-2026-35464 Aliases CVE-2026-48020GHSA-xf64-8mw2-4gr2

Traefik StripPrefix Route-Level Auth Bypass via Path Normalization

Priority MEDIUM 41CWE-288Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-288.

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00775 56th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed traefik (traefik): 3.7.3, 3.6.19, 2.11.48github.com/traefik/traefik/v2 (Go): 2.11.48+1 more productRed Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
traefiktraefik3.7.0-ea.1 to before 3.7.3; 3.0.0-beta1 to before 3.6.19; before 2.11.483.7.3, 3.6.19, 2.11.48Patch availableCNA
—github.com/traefik/traefik/v2 (Go)before 2.11.482.11.48Patch availableGHSA-xf64-8mw2-4gr2
—github.com/traefik/traefik/v3 (Go)before 3.6.193.6.19Patch availableGHSA-xf64-8mw2-4gr2
—github.com/traefik/traefik/v3 (Go)3.7.0-ea.1 to before 3.7.33.7.3Patch availableGHSA-xf64-8mw2-4gr2
  • traefik Vendortraefik Affected 3.7.0-ea.1 to before 3.7.3; 3.0.0-beta1 to before 3.6.19; before 2.11.48 Fixed in 3.7.3, 3.6.19, 2.11.48 Patch available CNA
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.11.48 Fixed in 2.11.48 Patch available GHSA-xf64-8mw2-4gr2
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected before 3.6.19 Fixed in 3.6.19 Patch available GHSA-xf64-8mw2-4gr2
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0-ea.1 to before 3.7.3 Fixed in 3.7.3 Patch available GHSA-xf64-8mw2-4gr2

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.48; 3.0.0 to before 3.6.19; 3.7.0 to before 3.7.3Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.48; 3.0.0 to before 3.6.19; 3.7.0 to before 3.7.3 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 3.7.3, 3.6.19, 2.11.48
  • Fix · GHSA-xf64-8mw2-4gr2 github.com/traefik/traefik/v2 (Go) Fixed in 2.11.48 Advisory →
  • Fix · GHSA-xf64-8mw2-4gr2 github.com/traefik/traefik/v3 (Go) Fixed in 3.6.19 Advisory →
  • Fix · GHSA-xf64-8mw2-4gr2 github.com/traefik/traefik/v3 (Go) Fixed in 3.7.3 Advisory →

Red Hat 1 advisory

  • RHSA-2026:62260 Released 2026-09-01 · Red Hat rating Important
    Red Hat OpenShift Dev Spaces 3.30.0 Release.
    • Red Hat OpenShift Dev Spaces 3.30 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/configbump-rhel9, registry.redhat.io/devspaces/dashboard-rhel9 +7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Dev Spaces 3.30Fixed RHSA-2026:62260
Not affected: 1 product
  • Red Hat OpenShift Dev Spaces 3.30

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48020
  2. 2026-10-03 Alias added: GHSA-xf64-8mw2-4gr2

References

Exploit 1

Patch 3

Advisory 1

Other 5

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-25774 Uncontrolled Resource Consumption in Traefik CVSS 3.1HIGH 7.5
  • TI-2025-40914 Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules CVSS 4.0MEDIUM 6.9
  • TI-2022-07529 Authorization header displayed in the debug logs CVSS 3.1MEDIUM 6.5
  • TI-2024-30459 HTTP client can remove the X-Forwarded headers in Traefik CVSS 3.1CRITICAL 9.8
  • TI-2026-60261 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect CVSS 4.0CRITICAL 9.3
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences