{"id":"UBUNTU-CVE-2026-45084","details":"OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions 3.4.0 through 3.6.5 contain a denial of service vulnerability in the presence module. When the presence module's handle_publish() function processes a SIP PUBLISH request with an Event: presence header and a message body while the configuration option enable_sphere_check=1 is set, it invokes the get_content_type() macro without first calling parse_content_type_hdr(), causing it to dereference uninitialized or NULL Content-Type parsing state and crash. If a Content-Type header is present but unparsed, msg-\u003econtent_type-\u003eparsed is NULL and is dereferenced as a content_t pointer; if the request lacks a Content-Type header entirely, msg-\u003econtent_type itself is NULL, and both cases lead to a crash. A remote attacker can therefore cause a denial of service against an affected instance with a single PUBLISH request over UDP or TCP, using either a valid Content-Type: application/pidf+xml request or one with the header removed, and the vulnerable code path itself does not enforce authentication (though a deployment's routing configuration may require it before this route is reached). The issue has been fixed in version 3.6.6 and 4.0.0-rc1.","modified":"2026-08-06T03:09:02.051030744Z","published":"2026-08-04T22:17:00Z","upstream":["CVE-2026-45084"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45084"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-45084"},{"type":"REPORT","url":"https://github.com/OpenSIPS/opensips/security/advisories/GHSA-h3ww-hchh-x2g9"}],"affected":[{"package":{"name":"opensips","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/opensips?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.2-3build2","2.2.2-3build3","2.2.2-3build4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.2-3build4","binary_name":"opensips"},{"binary_name":"opensips-b2bua-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-berkeley-bin"},{"binary_name":"opensips-berkeley-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-carrierroute-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-compression-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-console"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-cpl-module"},{"binary_name":"opensips-dbhttp-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-dialplan-module"},{"binary_name":"opensips-emergency-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-geoip-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-http-modules","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-identity-module"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-jabber-module"},{"binary_name":"opensips-json-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-ldap-modules","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-lua-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-memcached-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-mysql-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-perl-modules"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-postgres-module"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-presence-modules"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-rabbitmq-module"},{"binary_name":"opensips-radius-modules","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-redis-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-regex-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-restclient-module"},{"binary_name":"opensips-sctp-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-snmpstats-module","binary_version":"2.2.2-3build4"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-sqlite-module"},{"binary_version":"2.2.2-3build4","binary_name":"opensips-tls-module"},{"binary_name":"opensips-tlsmgm-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-unixodbc-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-wss-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-xmlrpc-module","binary_version":"2.2.2-3build4"},{"binary_name":"opensips-xmpp-module","binary_version":"2.2.2-3build4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45084.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}