---
cve: "CVE-2026-76956"
severity: "MEDIUM"
cvss: 5.9
epss: "26%"
vendor: "libexpat project"
kev: false
exploited: false
published: "2026-08-20 05:16:29"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T15:23:52+02:00"
---

# CVE-2026-76956

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 12cf0b1f25f026a022fe728ad8f7e3d017285b80 (Commit)

## Referenzen

- <https://github.com/libexpat/libexpat/pull/1326>
- <https://github.com/libexpat/libexpat/pull/1329>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76956) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_