Bug 2445116 (CVE-2026-28799)

Summary: CVE-2026-28799 PJSIP: PJSIP: Denial of Service via heap use-after-free in event subscription
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PJSIP. A remote attacker can exploit a heap use-after-free vulnerability within the event subscription framework by sending a specially crafted message during presence unsubscription. This can lead to a denial of service, making the affected system unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2445122, 2445124    
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Description OSIDB Bzimport 2026-03-06 07:02:00 UTC
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.