---
id: CVE-2026-41069
title: libheif is a HEIF and AVIF file format decoder and encoder
summary: >-
  libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2
  and prior, a malformed HEIF sequence file can trigger an out-of-bounds read in
  core sequence parsing logic, causing DoS. A malformed file can have
  stco.entry_…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
  - CWE-476
vendor: struktur
product: libheif
affected:
  - libheif < 1.22.0
patched:
  - libheif 1.22.0
published: '2026-05-22'
updated: '2026-07-23'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-41069'
references:
  - url: 'https://github.com/strukturag/libheif/releases/tag/v1.22.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r
    label: security-advisories@github.com
  - url: >-
      https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00388
epssPercentile: 0.30144
ingestedAt: '2026-07-23T11:17:34.190Z'
---

## Overview

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a malformed HEIF sequence file can trigger an out-of-bounds read in core sequence parsing logic, causing DoS. A malformed file can have stco.entry_count == 0 (creating no chunks) while still passing validation because saio.entry_count == 0 matches, but with saiz.sample_count > 0 the SampleAuxInfoReader constructor still enters its loop. This leads to an out-of-bounds dereference on the empty chunks[0] in chunked mode.

## Affected

- `libheif < 1.22.0`

## Remediation

Upgrade past the affected range:

- `libheif 1.22.0`