CVE-2026-32738Public exploitNetwork attack vector

Process crash via unchecked zero samples-per-chunk

Published May 19, 2026 · Updated May 19, 2026

Out-of-bounds read in Struktur AG libheif before 1.22.0 allows remote attackers to crash a decoding process via a crafted HEIF sequence. Box_stsc::parse accepts a zero samples_per_chunk value, causing Chunk to underflow its last-sample index and read index zero from an empty vector. Exploitation requires the sequence to reach first-frame sample access; the deterministic null-page read terminates the host decoding process.

CVSS severity6.5
Medium
EPSS probability0.30%
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 remote attackers to crash a decoding process via a crafted HEIF sequence. Box_stsc::parse accepts a zero samples_per_chunk value, causing Chunk to underflow its last-sample index and read index zero from an empty vector. Exploitation requires the sequence to reach first-frame sample access; the deterministic null-page read terminates the host decoding process.

The record

CVE
CVE-2026-32738
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-125, CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 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

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 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-125Out-of-bounds Read
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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