← Vulnerability feed

Vulnerability record · CVE-2026-28799 · published 6 March 2026

CVE-2026-28799: Pjsip use after free vulnerability

Pjsip · Pjsip

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.

8.7 CVSS 4.0 High EPSS 0.49% · top 60.5% CWE-416 · Use after free
8.7CVSS 4.0 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pjsip/pjproject/commit/e06ff6c64741cc1675fd3296615910f532f6b1a1 Patch
https://github.com/pjsip/pjproject/security/advisories/GHSA-8fj4-fv9f-hjpc PatchVendor Advisory

Track CVE-2026-28799 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-23547Pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 0.95%9.8CVE-2022-39244Pjsip classic buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. In versions of PJSIP prior to 2.13 the PJSIP parser, PJMEDIA RTP decod…EPSS 1.2%9.8CVE-2022-24786Pjsip out-of-bounds read vulnerabilityPJSIP is a free and open source multimedia communication library written in C. PJSIP versions 2.12 and prior do not parse incoming RTCP feedback RPSI…EPSS 2.0%8.7CVE-2026-29068Pjsip stack-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, there is a stack buffer overflow vulnerability …EPSS 0.53%8.5CVE-2026-40614Pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, there is a buffer overflow when decoding Opus aud…EPSS 0.37%8.4CVE-2026-32945Pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. Versions 2.16 and below have a Heap-based Buffer Overflowvulnerability…EPSS 0.54%8.1CVE-2026-40892Pjsip stack-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_crea…EPSS 0.60%8.1CVE-2026-26967Pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below, there is a critical Heap-based Buffer Over…EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2026-28799), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.