Pjsip CVE-2026-28799
HIGHCVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in version 2.17.
AnalysisAI
PJSIP versions prior to 2.17 contain a heap use-after-free vulnerability in the event subscription framework that can be triggered through presence unsubscription requests, allowing remote attackers without authentication to cause denial of service. The vulnerability resides in the evsub.c component and is exploitable over the network with no user interaction required. …
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RemediationAI
Within 24 hours: Inventory all systems running PJSIP and identify version numbers; assess exposure in production environments. Within 7 days: Develop and test patches in staging environment; establish maintenance window for affected systems. …
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