CVE-2026-47247: libheif is a HEIF and AVIF file format decoder and encoder

Q: How do I fix CVE-2026-47247?

libheif: upgrade to 1.22.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-47247 being exploited?

CVE-2026-47247 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-47247 affect?

CVE-2026-47247 affects libheif. Severity is high (CVSS 7.5). 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 a

Q: How urgent is CVE-2026-47247?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-47247 is a high-severity flaw (CVSS 7.5) affecting libheif. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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-downlo

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-200, CWE-226, CWE-682, CWE-908
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: struktur

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 22:17 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

struktur libheif UPGRADE

Affected: < 1.22.0

Fixed in: 1.22.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libheif || rpm -q libheif || libheif --version

2. UPGRADE to 1.22.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libheif

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libheif

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47247?

libheif: upgrade to 1.22.0. Exact commands for each OS are on this page.

Is CVE-2026-47247 being exploited?

CVE-2026-47247 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47247 affect?

CVE-2026-47247 affects libheif. Severity is high (CVSS 7.5). 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 a

How urgent is CVE-2026-47247?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities · ImageMagick vulnerabilities

Related CVEs

CVE-2026-47178 MEDIUM 6.1 UPGRADE libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-47251 MEDIUM 6.1 UPGRADE libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-47254 MEDIUM 6.1 UPGRADE libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-47709 MEDIUM 5.5 UPGRADE libheif is a HEIF and AVIF file format decoder and encoder
CVE-2026-47714 MEDIUM 6.1 UPGRADE libheif is a HEIF and AVIF file format decoder and encoder

References

← Back to latest CVEs