Traefik allows path traversal using url encoding

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2025-47952: 0.98% estimated exploitation activity in the next 30 days; percentile 62.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact There is a potential vulnerability in Traefik managing the requests using a PathPrefix, Path or PathRegex matcher. When Traefik is configured to route the requests to a backend using a matcher based on the path, if the URL contains a URL encoded string in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain. Example In such a case, the request http://mydomain.example.com/service/sub-path/%2e%2e/other-path will reach the backend my-service-a without operating the middleware my-middleware-a unless the computed path is http://mydomain.example.com/service/other-path and should be computes by the first router (operating my-middleware-a). Patches - https://github.com/traefik/traefik/releases/tag/v2.11.25 - https://github.com/traefik/traefik/releases/tag/v3.4.1 For more information If you have any questions or comments about this advisory, please open an issue. <details <summaryOriginal Description</summary Summary Path traversal…

Published by the source

28 May 2025, 14:25 UTC

Last modified by the source

27 Nov 2025, 08:04 UTC

Source last checked

26 Oct 2026, 15:13 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-vrch-868g-9jx5

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# Patch Next advisory brief: CVE-2025-47952

Advisory: Traefik allows path traversal using url encoding
IDs: CVE-2025-47952, GHSA-vrch-868g-9jx5
Record: https://patchnext.com/advisories/cve-2025-47952 (revision 1, source checked 26 Oct 2026, 15:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/traefik/traefik/v3 3.4.1; github.com/traefik/traefik/v2 2.11.25. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/traefik/traefik/v3: affected <= 3.4.0; fixed in 3.4.1
- Go github.com/traefik/traefik/v2: affected < 2.11.25; fixed in 2.11.25
- Go github.com/traefik/traefik: affected <= 1.7.34

## Suggested inspection (read-only)
- Go github.com/traefik/traefik/v3: check the installed version with your package manager.
- Go github.com/traefik/traefik/v2: check the installed version with your package manager.
- Go github.com/traefik/traefik: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/traefik/traefik/v3, github.com/traefik/traefik/v2, github.com/traefik/traefik.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vrch-868g-9jx5 (GitHub-reviewed advisory GHSA-vrch-868g-9jx5 lists affected ranges: Go github.com/traefik/traefik/v3 >=0 =0 =0 <2.11.25)

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