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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
pjsip pjproject affected
Version Status Constraints
< 2.17 affected —

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/pjsip/pjproject/commit/e06ff6c64741cc1675fd3296615910f532f6b1a1 cve-icon cve-icon
https://github.com/pjsip/pjproject/security/advisories/GHSA-8fj4-fv9f-hjpc cve-icon cve-icon
History

Fri, 06 Mar 2026 07:00:00 +0000

Type Values Removed Values Added
Description 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.
Title PJSIP: Heap use-after-free in PJSIP presence subscription termination handler
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-06T06:36:55.109Z

Reserved: 2026-03-03T14:25:19.245Z

Link: CVE-2026-28799

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-06T07:16:00.527

Modified: 2026-03-06T07:16:00.527

Link: CVE-2026-28799

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses