CVE-2026-68516Public exploitNetwork attack vector

Application crash via unchecked HTJ2K tile geometry

Published Aug 24, 2026 · Updated Aug 25, 2026

Out-of-bounds write in OpenEXR 3.4.0 through 3.4.13 allows remote attackers to crash applications via a crafted HTJ2K EXR file. The HTJ2K path compares only visible codestream dimensions with the EXR chunk and fails to reject SIZ tile-grid geometry whose first tile misses the image, leading the vendored OpenJPH AVX2 decoder to write past its stack scratch buffer. Successful exploitation requires a victim application or user to decode the file, and the demonstrated consequence is a process crash.

CVSS severity6.5
Medium
EPSS probability0.25%
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 write in OpenEXR 3.4.0 through 3.4.13 allows remote attackers to crash applications via a crafted HTJ2K EXR file. The HTJ2K path compares only visible codestream dimensions with the EXR chunk and fails to reject SIZ tile-grid geometry whose first tile misses the image, leading the vendored OpenJPH AVX2 decoder to write past its stack scratch buffer. Successful exploitation requires a victim application or user to decode the file, and the demonstrated consequence is a process crash.

The record

CVE
CVE-2026-68516
Published
Aug 24, 2026
Updated
Aug 25, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-787, CWE-121, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=>= 3.4.0, < 3.4.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=>= 3.4.0, < 3.4.14

Published CVSS scores

6.5GitHub Security AdvisoriesCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/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.

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-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1204.002Malicious File

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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