---
cve: "CVE-2026-84384"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "strukturag"
kev: false
exploited: false
published: "2026-09-18 16:17:11"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T10:48:46+02:00"
---

# CVE-2026-84384

> 7.5 HIGH · 🧪 PoC

## Beschreibung

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| 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)

- 21893e8f66c8b79363ca2809391b07d35e1a95ec (Commit)
- ac1cb05c39008f01525c991ff8b88f84ddf70fd2 (Commit)

## Referenzen

- <https://github.com/strukturag/libheif/security/advisories/GHSA-24wx-9w62-c96w>
- <https://github.com/strukturag/libheif/commit/21893e8f66c8b79363ca2809391b07d35e1a95ec>
- <https://github.com/strukturag/libheif/releases/tag/v1.23.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-84384) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_