CVE-2025-12642

CriticalCVSS 9.1/10Last modified Oct 19, 2026

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

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-444

Affected software

No affected versions have been published.

Timeline

Published
Nov 3, 2025
Last modified
Oct 19, 2026
NVD status
Analyzed

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CVE-2025-12642: Critical severity, CVSS 9.1 | Vulnix