GHSA-rhg6-2vjh-j5qc: Duplicate Advisory Authentication Bypass Vulnerability

HIGH
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CWE-22
Published
Advisory Summary

GHSA-rhg6-2vjh-j5qc is a HIGH authentication bypass vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves traefik: authentication bypass via path traversal in replacepathregex middleware. Remediation is available in the latest vendor maintenance releases.

GHSA-rhg6-2vjh-j5qc at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-rhg6-2vjh-j5qc
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Duplicate Advisory
Package Ecosystem Go
Published Date
Last Updated

How to Fix GHSA-rhg6-2vjh-j5qc

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/traefik/traefik/v2 fixed: Latest secure release 
Upgrade github.com/traefik/traefik/v2 to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/traefik/traefik/v2

How to Check if You Are Affected

To determine whether your application is affected by GHSA-rhg6-2vjh-j5qc, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for github.com/traefik/traefik/v2

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-cxjq-mrr5-89rv. This link is maintained to preserve external references. ## Original Description Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= 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.

GHSA-rhg6-2vjh-j5qc Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/traefik/traefik/v2
golang/github.com/traefik/traefik/v2
Go
≤ 2.11.51

References

GitHub Advisory / Wiki ADVISORY
https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv
NVD — GHSA-rhg6-2vjh-j5qc NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65600
www.vulncheck.com/advisories/traefik-... WEB
https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex

Frequently Asked Questions

What is GHSA-rhg6-2vjh-j5qc?
GHSA-rhg6-2vjh-j5qc is a security vulnerability in Duplicate Advisory involving Traefik: Authentication Bypass via Path Traversal in ReplacePathRegex Middleware under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/traefik/traefik/v2.
What version fixes GHSA-rhg6-2vjh-j5qc?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/traefik/traefik/v2 affected?
Yes, github.com/traefik/traefik/v2 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-rhg6-2vjh-j5qc?
GHSA-rhg6-2vjh-j5qc is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check Go dependencies for GHSA-rhg6-2vjh-j5qc?
Run the dependency tree command: 'inspect dependencies for github.com/traefik/traefik/v2'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rhg6-2vjh-j5qc",
  "modified" : "2026-08-06T16:50:45Z",
  "published" : "2026-07-22T12:32:18Z",
  "withdrawn" : "2026-08-06T16:50:45Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Traefik: Authentication Bypass via Path Traversal in ReplacePathRegex Middleware",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-cxjq-mrr5-89rv. This link is maintained to preserve external references.\n\n## Original Description\nTraefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS: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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/traefik/traefik/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.11.51"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-65600"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-06T16:50:45Z",
    "nvd_published_at" : "2026-07-22T12:18:20Z"
  }
}