OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AcademySoftwareFoundation openexr affected
Version Status Constraints
>= 3.4.0, < 3.4.13 affected —

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c11f26cf47584cc2b35721 cve-icon cve-icon
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13 cve-icon cve-icon
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293 cve-icon cve-icon cve-icon
History

Tue, 25 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 25 Aug 2026 19:15:00 +0000

Type Values Removed Values Added
Description OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.
Title OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)
Weaknesses CWE-125
CWE-20
References
Metrics cvssV4_0

{'score': 6.7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-25T19:16:25.169Z

Reserved: 2026-07-23T18:54:15.831Z

Link: CVE-2026-65979

cve-icon Vulnrichment

Updated: 2026-08-25T19:16:18.869Z

cve-icon NVD

Status : Received

Published: 2026-08-25T19:16:52.307

Modified: 2026-08-25T20:17:01.020

Link: CVE-2026-65979

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses