CVE-2025-68431Network attack vector

Crash via oversized overlay row copy

Published Dec 29, 2025 · Updated Dec 29, 2025

Out-of-bounds read in libheif before 1.21.0 allows context-dependent attackers to crash image-processing applications via crafted HEIF files. HeifPixelImage::overlay() subtracts the input x offset from the row width and passes the resulting signed length to memcpy, where conversion to size_t produces an oversized copy. Exploitation requires a consuming application or user to decode an HEIF containing an iovl overlay item; the documented consequence is a process crash.

CVSS severity6.5
Medium
EPSS probability0.33%
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 libheif before 1.21.0 allows context-dependent attackers to crash image-processing applications via crafted HEIF files. HeifPixelImage::overlay() subtracts the input x offset from the row width and passes the resulting signed length to memcpy, where conversion to size_t produces an oversized copy. Exploitation requires a consuming application or user to decode an HEIF containing an iovl overlay item; the documented consequence is a process crash.

The record

CVE
CVE-2025-68431
Published
Dec 29, 2025
Updated
Dec 29, 2025
Vendor
Struktur AG
Product
libheif
Classifications
CWE-125, CWE-190, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 29, 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=< 1.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=< 1.21.0

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
7.1NIST NVDCVSS:3.1/AV:N/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.

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

No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

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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