CVE-2025-12642

lighttpd1.4.80 incorrectly merged trailer fields into headers aft ...

Published 3 Nov 2025Modified 19 Oct 2026CWE 444

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by NVD.

Description

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

Affected packages and fixed versions

Source	Package	Fixed in
rapidfort alpine 3.20	lighttpd	1.4.81-r0
rapidfort alpine 3.21	lighttpd	1.4.81-r0
rapidfort alpine 3.22	lighttpd	1.4.81-r0
rapidfort alpine 3.23	lighttpd	1.4.81-r0
rapidfort alpine 3.24	lighttpd	1.4.81-r0

References

https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1

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