🛡️ CVE-2026-47247 on Ubuntu — libheif

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-47247 as tracked by Ubuntu, for the package libheif. The fix is available in version 1.21.2-3ubuntu0.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

UBUNTU-CVE-2026-47247 is classified as CWE-200: Exposure of Sensitive Information. Information that should stay internal is disclosed to someone who is not authorised to see it.

Affected software

UBUNTU-CVE-2026-47247 is recorded against 1 package.

libheif (fixed in 1.21.2-3ubuntu0.1)

Timeline and source

Published on 21 July 2026 and last revised on 29 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-21

Updated 2026-08-12

Modified 2026-07-29

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libheif	—	1.21.2-3ubuntu0.1

References

REPORT https://ubuntu.com/security/CVE-2026-47247

REPORT https://www.cve.org/CVERecord?id=CVE-2026-47247

REPORT https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3

🔗 NVD 🔗 Mitre

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