What is CVE-2026-28799?

CVE-2026-28799 is a high-severity vulnerability in Pjsip Pjproject, classified under Use After Free. CVSS score: 7.5/10. Published 2026-03-06.

How severe is CVE-2026-28799?

High severity. CVSS v3 base score is 7.5 out of 10.

Use After Free in Pjsip Pjproject

CVE-2026-28799

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 unsubscrip…

Vulnerability class: Use-After-Free

EPSS: 0.003 (20.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Pjsip Pjproject — versions < 2.17
Pjsip

Weakness classification (CWE)

CWE-416 — Use After Free

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-28799?: CVE-2026-28799 is a high-severity vulnerability in Pjsip Pjproject, classified under Use After Free. CVSS score: 7.5/10. Published 2026-03-06.
How severe is CVE-2026-28799?: High severity. CVSS v3 base score is 7.5 out of 10.