---
id: CVE-2026-84449
title: libheif is a HEIF and AVIF file format decoder and encoder
summary: >-
  libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6,
  Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an
  integer width that can overflow for extremely large RGB images created through
  heif_…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
  - CWE-190
vendor: strukturag
product: libheif
affected:
  - libheif < 1.19.6
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T15:17:19.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84449'
references:
  - url: >-
      https://github.com/strukturag/libheif/commit/e29953da30eb11aa1762df0bff3b36be4b22fbe3
    label: security-advisories@github.com
  - url: 'https://github.com/strukturag/libheif/releases/tag/v1.19.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq
    label: security-advisories@github.com
  - url: >-
      https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84449.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-84449'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84449'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T14:52:03.728215Z'
epss: 0.00429
epssPercentile: 0.34387
ingestedAt: '2026-09-18T16:45:41.395Z'
---

## Overview

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84449.json)