---
cve: "CVE-2026-76957"
severity: "MEDIUM"
cvss: 4.9
epss: "0.1%"
vendor: "libexpat project"
kev: false
exploited: false
published: "2026-08-20 04:28:04"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T20:06:10+02:00"
---

# CVE-2026-76957

> 4.9 MEDIUM · 🧪 PoC

## Beschreibung

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 12cf0b1f25f026a022fe728ad8f7e3d017285b80 (Commit)

## Referenzen

- <https://github.com/libexpat/libexpat/pull/1322>
- <https://github.com/libexpat/libexpat/pull/1329>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76957) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_