CVE-2026-32882Public exploitNetwork attack vector

Crash and heap disclosure via wrong alpha stride

Published May 19, 2026 · Updated May 19, 2026

Out-of-bounds read in Struktur AG libheif 1.21.2 and earlier allows attackers to crash decoders or disclose heap data via crafted HEIF files. HeifPixelImage::overlay() uses the color-plane in_stride to index the alpha plane instead of alpha_stride when their bit depths differ, reading beyond the alpha buffer. Exploitation requires an application to decode an overlay image with mismatched color and alpha bit depths; consequences are limited to a process crash or adjacent heap bytes appearing in decoded pixels.

CVSS severity7.1
High
EPSS probability0.32%
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 1.21.2 and earlier allows attackers to crash decoders or disclose heap data via crafted HEIF files. HeifPixelImage::overlay() uses the color-plane in_stride to index the alpha plane instead of alpha_stride when their bit depths differ, reading beyond the alpha buffer. Exploitation requires an application to decode an overlay image with mismatched color and alpha bit depths; consequences are limited to a process crash or adjacent heap bytes appearing in decoded pixels.

The record

CVE
CVE-2026-32882
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-125, T1203
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

7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
7.1Red HatCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1203Exploitation for Client Execution

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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