---
cve: "CVE-2026-32740"
severity: "HIGH"
cvss: 8.8
epss: "51%"
vendor: "strukturag"
kev: false
exploited: false
published: "2026-05-19 20:16:18"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T07:46:29+02:00"
---

# CVE-2026-32740

> 8.8 HIGH · 🧪 PoC

## Beschreibung

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 0c81a846b7401dbdb7118afd0761057f21e43511 (Commit)

## Referenzen

- <https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j>
- <https://github.com/strukturag/libheif/releases/tag/v1.22.0>
- <https://access.redhat.com/security/cve/CVE-2026-32740>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2479969>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32740.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-32740) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_