CVE-2026-47247

Publication date 21 July 2026

Last updated 7 August 2026

Ubuntu priority

Cvss 3 Severity Score

Description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libheif	26.04 LTS resolute	Fixed 1.21.2-3ubuntu0.1
	25.10 questing	Fixed 1.20.2-1ubuntu0.4
	24.04 LTS noble	Fixed 1.17.6-1ubuntu4.4
	22.04 LTS jammy	Fixed 1.12.0-2ubuntu0.1~esm3
	20.04 LTS focal	Fixed 1.6.1-1ubuntu0.1~esm3
	18.04 LTS bionic	Not affected

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Notes

kkernick

This vulnerability shares the same fix as CVE-2026-32814.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libheif	Upstream: 6aca89d

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	None
Availability impact	None

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

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