CVE-2025-12642
CVE-2025-12642 · HTTP Header Smuggling via Trailer Merge
This page contains facts from public vulnerability sources. Check the original advisory before updating.
lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80
CVSS 6.9 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
lighttpd
- Versions
- ≥ 1.4.80, < 1.4.81: Affected (custom)
Update to 1.4.81
lighttpd Ubuntu:Pro:14.04:LTS
- Versions
- 1.4.31-3ubuntu3
- 1.4.33-1ubuntu1
- 1.4.33-1+nmu2ubuntu1
- 1.4.33-1+nmu2ubuntu2
- 1.4.33-1+nmu2ubuntu2.1
- 1.4.33-1+nmu2ubuntu2.1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:Pro:16.04:LTS
- Versions
- 1.4.35-4ubuntu1
- 1.4.35-4ubuntu2
- 1.4.35-4ubuntu2.1
- 1.4.35-4ubuntu2.1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:Pro:18.04:LTS
- Versions
- 1.4.45-1ubuntu1
- 1.4.45-1ubuntu3
- 1.4.45-1ubuntu3+esm1
- 1.4.45-1ubuntu3.18.04
- 1.4.45-1ubuntu3.18.04+esm1
- 1.4.45-1ubuntu3.18.04.1
- 1.4.45-1ubuntu3.18.04.1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:20.04:LTS
- Versions
- 1.4.53-4ubuntu2
- 1.4.54-2ubuntu1
- 1.4.55-1ubuntu1
- 1.4.55-1ubuntu1.20.04.1
- 1.4.55-1ubuntu1.20.04.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:22.04:LTS
- Versions
- 1.4.59-1ubuntu2
- 1.4.59-1ubuntu3
- 1.4.63-1ubuntu1
- 1.4.63-1ubuntu2
- 1.4.63-1ubuntu3
- 1.4.63-1ubuntu3.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:24.04:LTS
- Versions
- 1.4.69-1ubuntu1
- 1.4.69-1ubuntu2
- 1.4.73-1ubuntu1
- 1.4.73-1ubuntu2
- 1.4.74-1ubuntu2
- 1.4.74-1ubuntu3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:25.10
- Versions
- 1.4.79-1ubuntu1
- 1.4.79-2ubuntu1
- 1.4.82-2ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:26.10
- Versions
- 1.4.82-2ubuntu2
- 1.4.84-1ubuntu3
- 1.4.85-1ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
lighttpd Ubuntu:26.04:LTS
- Versions
- 1.4.82-2ubuntu1
- 1.4.82-2ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published