CVE-2026-47247Public exploitNetwork attack vector

Heap disclosure via uncovered uninitialized grid pixels

Published Jul 21, 2026 · Updated Jul 21, 2026

Information disclosure in libheif before 1.22.0 allows remote attackers to read process heap data via crafted grid images. The grid coverage check truncates tile widths while pixel-plane allocation leaves padding uninitialized, so uncovered canvas pixels expose stale heap bytes. Exploitation requires a crafted HEIF or AVIF file to be decoded and its output exposed; server-side transcoders can return heap data in pixels.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in libheif before 1.22.0 allows remote attackers to read process heap data via crafted grid images. The grid coverage check truncates tile widths while pixel-plane allocation leaves padding uninitialized, so uncovered canvas pixels expose stale heap bytes. Exploitation requires a crafted HEIF or AVIF file to be decoded and its output exposed; server-side transcoders can return heap data in pixels.

The record

CVE
CVE-2026-47247
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-682, CWE-226, CWE-908, CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=< 1.22.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-682Incorrect Calculation
CWE-226Sensitive Information in Resource Not Removed Before Reuse
CWE-908Use of Uninitialized Resource
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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