CVE-2026-28799 — Use After Free in Pjproject

CWE-416 — Use After FreeCWE-825 — Expired Pointer Dereference4 documents4 sources
Severity
8.7HIGHNVD
EPSS
0.1%
top 81.14%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Pjsip PjprojectPjsip
Timeline
PublishedMar 6

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.

CVSS 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

Affected Packages2 packages

▶NVDpjsip/pjsip< 2.17
▶CVEListV5pjsip/pjproject< 2.17

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

1
OSV
CVE-2026-28799: PJSIP is a free and open source multimedia communication library written in C↗2026-03-06
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📋Vendor Advisories

1
Red Hat
PJSIP: PJSIP: Denial of Service via heap use-after-free in event subscription↗2026-03-06
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🕵️Threat Intelligence

1
Wiz
CVE-2026-28799 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-28799 — Use After Free in Pjsip Pjproject | cvebase