---
cve: "CVE-2026-28799"
severity: "HIGH"
cvss: 8.7
epss: "29%"
vendor: "pjsip"
kev: false
exploited: false
published: "2026-03-06 07:16:00"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T05:15:49+02:00"
---

# CVE-2026-28799

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 5a457451fa2712ba18e12b01738e8ff3af2b26fd (Commit)
- e06ff6c64741cc1675fd3296615910f532f6b1a1 (Commit)

## Referenzen

- <https://github.com/pjsip/pjproject/security/advisories/GHSA-8fj4-fv9f-hjpc>
- <https://github.com/pjsip/pjproject/commit/e06ff6c64741cc1675fd3296615910f532f6b1a1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-28799) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_