CVE-2025-12642 — HTTP Header Smuggling via Trailer Merge
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 ex…
Published: 2025-11-03 · CVSS: 6.9 · CVSS 4.0
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7