GHSA-5423-jcjm-2gpv Traefik affected by Go HTTP Request Smuggling Vulnerability
Traefik is vulnerable to HTTP request smuggling via invalid chunked data, allowing attackers to bypass security controls or access sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-5423-jcjm-2gpv?
GHSA-5423-jcjm-2gpv is a vulnerability in github.com/traefik/traefik, published on 18 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Summary
net/http: request smuggling through invalid chunked data: The net/http package accepts data in the chunked transfer encoding containing an invalid chunk-size line terminated by a bare LF. When used in conjunction with a server or proxy which incorrectly interprets a bare LF in a chunk extension as part of the extension, this could permit request smuggling. [CVE-2025-22871] Vendor Affected Components: Go: 1.23.x < 1.23.8
More Details: CVE-2025-22871
Patches
Which versions are affected by GHSA-5423-jcjm-2gpv?
9 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v3 Go | All versions | 3.3.6, 3.4.0-rc2 |
github.com/traefik/traefik/v3 Go | All versions | 3.3.6 |
github.com/traefik/traefik/v3 Go | All versions | 3.3.6 |
github.com/traefik/traefik/v3 Go | From 3.4.0-rc1 | 3.4.0-rc2 |
github.com/traefik/traefik/v3 Go | From 3.4.0-rc1 | 3.4.0-rc2 |
github.com/traefik/traefik Go | All versions | None |
3 more packages
github.com/traefik/traefik/v2 Go | All versions | 2.11.24 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.24 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.24 |
How do I fix GHSA-5423-jcjm-2gpv?
Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.3.6 or 3.4.0-rc2.
Is GHSA-5423-jcjm-2gpv being exploited?
There is no known exploitation of GHSA-5423-jcjm-2gpv in the wild and no public exploit code.
Sources
Also known as GO-2025-3627.