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CVE-2026-47247

Struktur Libheif information disclosure

7.5 HIGHPublic exploitEPSS 0.48%
  1. Published21 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Struktur Libheif< 1.22.0

Remediation

Fixed in
Struktur Libheif≥ 1.22.0

References

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Frequently asked

Is CVE-2026-47247 being actively exploited?

CVE-2026-47247 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.48%.

How severe is CVE-2026-47247?

CVE-2026-47247 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.48% probability of exploitation.

Which products are affected by CVE-2026-47247?

Affected products include Struktur Libheif.

How do I fix CVE-2026-47247?

Upgrade affected software to a fixed version, for example Struktur Libheif 1.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-47247 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.