---
cve: "CVE-2026-47251"
severity: "MEDIUM"
cvss: 6.8
epss: "0.2%"
vendor: "strukturag"
kev: false
exploited: false
published: "2026-07-21 22:17:12"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T04:44:15+02:00"
---

# CVE-2026-47251

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 0c81a846b7401dbdb7118afd0761057f21e43511 (Commit)

## Referenzen

- <https://github.com/strukturag/libheif/security/advisories/GHSA-p6q9-fhf2-vj9v>
- <https://github.com/strukturag/libheif/issues/1712>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47251) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_