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Fencer Intel
critical 9.1

GHSA-5423-jcjm-2gpv json

Traefik affected by Go HTTP Request Smuggling Vulnerability

published last yr. modified 8mo ago also GO-2025-3627

cvss
9.1
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

### 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](https://nvd.nist.gov/vuln/detail/CVE-2025-22871)

## Patches

- https://github.com/traefik/traefik/releases/tag/v2.11.24 - https://github.com/traefik/traefik/releases/tag/v3.3.6 - https://github.com/traefik/traefik/releases/tag/v3.4.0-rc2

Patch / fix

  • go github.com/traefik/traefik/v2 2.11.24
  • go github.com/traefik/traefik/v3 3.3.6, 3.4.0-rc2

Is GHSA-5423-jcjm-2gpv in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CVSS scores

assigned by version score vector
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/traefik/traefik/v2
<2.11.24
2.11.24
go github.com/traefik/traefik/v3
<3.3.6
>=3.4.0-rc1, <3.4.0-rc2
3.3.6
3.4.0-rc2
go github.com/traefik/traefik
all versions
 no fix listed

Classification

Weakness
  • CWE-1395 Dependency on Vulnerable Third-Party Component

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.