CVE-2026-55059Public exploitHinoki check available

Application crash via miscomputed sample-count coordinate

Published Aug 25, 2026 · Updated Aug 27, 2026

Heap out-of-bounds write in affected OpenEXR releases allows local users to crash applications through the public DeepImage API. SampleCountChannel::set derives Y from dataWindow.min.x rather than min.y, then writes through an unchecked index before _numSamples. Reachability requires a consuming application to call the row setter when the image window has unequal X and Y origins; standard EXR loading is not confirmed to reach it.

CVSS severity6.1
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Heap out-of-bounds write in affected OpenEXR releases allows local users to crash applications through the public DeepImage API. SampleCountChannel::set derives Y from dataWindow.min.x rather than min.y, then writes through an unchecked index before _numSamples. Reachability requires a consuming application to call the row setter when the image window has unequal X and Y origins; standard EXR loading is not confirmed to reach it.

The record

CVE
CVE-2026-55059
Published
Aug 25, 2026
Updated
Aug 27, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=< 3.2.10
  2. Affected versionversion=>= 3.3.0, < 3.3.12
  3. Affected versionversion=>= 3.4.0, < 3.4.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=< 3.2.10; version=>= 3.3.0, < 3.3.12; version=>= 3.4.0, < 3.4.13

Published CVSS scores

6.1GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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