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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
Use CWE-444, Lighttpd vendor hub and Lighttpd product page to widen CVE-2025-12642 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-11072, CVE-2014-2323 and CVE-2013-4559 for nearby disclosures in the same product family.