Traefik (pronounced traffic) is an HTTP reverse proxy and load balancer. Prior to versions 2.11.25 and 3.4.1, 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. This issue has been patched in versions 2.11.25 and 3.4.1.
CVE-2025-47952
This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 39% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.1
- EG Score
- 9.1(medium)
- EPSS
- 52.2%
- KEV
- Not listed
Published
May 30, 2025
Last Modified
November 25, 2025
Advisory Details (4)
Auto-updated Jul 20, 2026Path traversal still possible using url encoding · Advisory · traefik/traefik · GitHub
https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5v3.4.1
Patch available: traefik/traefik v3.4.1
https://github.com/traefik/traefik/releases/tag/v3.4.1v2.11.25
Patch available: traefik/traefik v2.11.25
https://github.com/traefik/traefik/releases/tag/v2.11.25commit 08d5dfee0164 (traefik/traefik)
Fix landed in traefik/traefik commit 08d5dfee0164 — awaiting tagged release
https://github.com/traefik/traefik/commit/08d5dfee0164aa54dd44a467870042e18e8d3f00Affected Packages
(3 across 1 ecosystem)
Go(3)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/traefik/traefik | — | — | — |
| github.com/traefik/traefik/v2 | — | 2.11.25 | — |
| github.com/traefik/traefik/v3 | — | 3.4.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 49× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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Related CVEs(same CWE)
Same CWE
10 shownCWE-22
Frequently asked(5)
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