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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2025-12642

HTTP Header Smuggling via Trailer Merge

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

lighttpd lighttpd

Default version status: unaffected

  • 1.4.80 to < 1.4.81affected

References