{"id":"UBUNTU-CVE-2022-41556","details":"A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.","modified":"2026-04-22T13:28:37.863996Z","published":"2022-10-06T18:17:00Z","related":["USN-5903-1"],"upstream":["CVE-2022-41556"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-41556"},{"type":"REPORT","url":"https://github.com/lighttpd/lighttpd1.4/pull/115"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5903-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2022-41556"}],"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-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/2022/UBUNTU-CVE-2022-41556.json"}},{"package":{"name":"lighttpd","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/lighttpd@1.4.63-1ubuntu3.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.63-1ubuntu3.1"}]}],"versions":["1.4.59-1ubuntu2","1.4.59-1ubuntu3","1.4.63-1ubuntu1","1.4.63-1ubuntu2","1.4.63-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-authn-gssapi"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-authn-pam"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-authn-sasl"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-deflate"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-geoip"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-maxminddb"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-mbedtls"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-nss"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-openssl"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-trigger-b4-dl"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-vhostdb-pgsql"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-webdav"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-mod-wolfssl"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-modules-dbi"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-modules-ldap"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-modules-lua"},{"binary_version":"1.4.63-1ubuntu3.1","binary_name":"lighttpd-modules-mysql"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2022/UBUNTU-CVE-2022-41556.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}