CVE-2026-47251Public exploit

Process crash via overflowing VVC length check

Published Jul 21, 2026 · Updated Jul 21, 2026

Out-of-bounds read in Struktur AG libheif before 1.22.0 allows attackers to crash applications by supplying a crafted VVC-track HEIF file. In vvdec_push_data2, unsigned addition wraps when validating a near-UINT32_MAX NAL-unit length, so vector insertion reads beyond the frame buffer. Exploitation requires VVC support and application processing of the file; the read usually crashes the process and can disclose adjacent heap data.

CVSS severity6.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Struktur AG libheif before 1.22.0 allows attackers to crash applications by supplying a crafted VVC-track HEIF file. In vvdec_push_data2, unsigned addition wraps when validating a near-UINT32_MAX NAL-unit length, so vector insertion reads beyond the frame buffer. Exploitation requires VVC support and application processing of the file; the read usually crashes the process and can disclose adjacent heap data.

The record

CVE
CVE-2026-47251
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-190, CWE-125, T1204.002
Attack vector
local
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 vectorlocal
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=< 1.22.0

Published CVSS scores

6.8GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
6.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

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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