{"id":"UBUNTU-CVE-2025-12642","details":"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","modified":"2026-01-20T19:01:10.422470Z","published":"2025-11-03T20:17:00Z","upstream":["CVE-2025-12642"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-12642"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-12642"},{"type":"REPORT","url":"https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1"}],"affected":[{"package":{"name":"lighttpd","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/lighttpd@1.4.33-1+nmu2ubuntu2.1+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.31-3ubuntu3","1.4.33-1ubuntu1","1.4.33-1+nmu2ubuntu1","1.4.33-1+nmu2ubuntu2","1.4.33-1+nmu2ubuntu2.1","1.4.33-1+nmu2ubuntu2.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-dev"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-mod-cml"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-mod-magnet"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-mod-mysql-vhost"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-mod-trigger-b4-dl"},{"binary_version":"1.4.33-1+nmu2ubuntu2.1+esm1","binary_name":"lighttpd-mod-webdav"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-12642.json"}},{"package":{"name":"lighttpd","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/lighttpd@1.4.35-4ubuntu2.1+esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.35-4ubuntu1","1.4.35-4ubuntu2","1.4.35-4ubuntu2.1","1.4.35-4ubuntu2.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-dev"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-mod-cml"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-mod-magnet"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-mod-mysql-vhost"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-mod-trigger-b4-dl"},{"binary_version":"1.4.35-4ubuntu2.1+esm1","binary_name":"lighttpd-mod-webdav"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-12642.json"}},{"package":{"name":"lighttpd","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/lighttpd@1.4.45-1ubuntu3.18.04.1+esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.45-1ubuntu1","1.4.45-1ubuntu3","1.4.45-1ubuntu3+esm1","1.4.45-1ubuntu3.18.04","1.4.45-1ubuntu3.18.04+esm1","1.4.45-1ubuntu3.18.04.1","1.4.45-1ubuntu3.18.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-dev"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-authn-gssapi"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-authn-ldap"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-authn-mysql"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-cml"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-geoip"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-magnet"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-mysql-vhost"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-trigger-b4-dl"},{"binary_version":"1.4.45-1ubuntu3.18.04.1+esm1","binary_name":"lighttpd-mod-webdav"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-12642.json"}},{"package":{"name":"lighttpd","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/lighttpd@1.4.55-1ubuntu1.20.04.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.53-4ubuntu2","1.4.54-2ubuntu1","1.4.55-1ubuntu1","1.4.55-1ubuntu1.20.04.1","1.4.55-1ubuntu1.20.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd-dev"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd-mod-authn-gssapi"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd-mod-authn-pam"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd-mod-authn-sasl"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","binary_name":"lighttpd-mod-cml"},{"binary_version":"1.4.55-1ubuntu1.20.04.2","bin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