Vulnerability Description
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->content_type->parsed is NULL and is dereferenced as a content_t pointer; if the request lacks a Content-Type header entirely, msg->content_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.
Related Weaknesses (CWE)
References
- https://github.com/OpenSIPS/opensips/security/advisories/GHSA-h3ww-hchh-x2g9
- https://github.com/OpenSIPS/opensips/security/advisories/GHSA-h3ww-hchh-x2g9
FAQ
What is CVE-2026-45084?
CVE-2026-45084 is a documented vulnerability. 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_...
How severe is CVE-2026-45084?
CVSS scoring is not yet available for CVE-2026-45084. Check NVD for updates.
Is there a patch for CVE-2026-45084?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.