CVE-2026-45809

OpenSIPS denial-of-service in watcherinfo XML generation (CVE-2026-45809). Affected: OpenSIPS before 3.6.6 and 4.0.0-rc1. Root cause: copying the stored watcher URI into a fixed-size stack buffer during presence.winfo watcherinfo XML generation when an oversized watcher entry is created by a long...

CVE-2026-45809 OpenSIPS: Denial of Service in watcherinfo XML generation from oversized watcher URI

OpenSIPS is a Session Initiation Protocol SIP server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the watcherinfo generation functionality. An attacker can create an oversized watcher entry by sending a SUBSCRIBE Event: presence request with a...