🛡️ CVE-2025-12642
🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-444 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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

Details

Severity CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-444
Public Exploit ✅ No
Source NVD
Published 2025-11-03
Updated 2026-06-02
Modified 2025-11-12

Affected Packages

Software From version Fixed in
lighttpd

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