CVE-2025-43966

Application crash via unchecked identity item reference

Published Apr 20, 2025 · Updated Apr 21, 2025

NULL pointer dereference in ImageItem_iden in Struktur AG libheif before 1.19.6 allows attackers to crash applications via crafted HEIF files. The identity-item methods obtain a referenced child image and dereference the returned pointer without checking whether that image exists. The crafted identity item must reference a nonexistent child and reach a color-space or pixel-depth query, terminating the process.

CVSS severity2.9
Low
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in ImageItem_iden in Struktur AG libheif before 1.19.6 allows attackers to crash applications via crafted HEIF files. The identity-item methods obtain a referenced child image and dereference the returned pointer without checking whether that image exists. The crafted identity item must reference a nonexistent child and reach a color-space or pixel-depth query, terminating the process.

The record

CVE
CVE-2025-43966
Published
Apr 20, 2025
Updated
Apr 21, 2025
Vendor
Struktur AG
Product
libheif
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record 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=0 <1.19.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=0 <1.19.6

Published CVSS scores

7.5National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.9MITRECVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
2.9SUSECVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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