CVE-2026-28799
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPjsip
PublishedMar 6, 2026
First seenMar 6, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- pjsip pjsip2.17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pjsip pjsip | v < 2.17 | 2.17 |
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