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 3.4.13, a crafted HTJ2K-compressed EXR can crash OpenEXR during normal decode. An HTJ2K-compressed EXR whose JPEG 2000 SIZ fields place the first tile outside the visible image can reach invalid tile and codeblock geometry in the vendored OpenJPH AVX2 decoder, causing a stack out-of-bounds write and denial of service. OpenEXR's HTJ2K path validates the decoded codestream dimensions against the EXR chunk size, but it does not reject SIZ image-offset/tile-grid geometry where the first tile does not intersect the image. This issue is fixed in version 3.4.14.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00247.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

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/45521f92104373b5c850f27f2d4659ab6759e848 cve-icon cve-icon
https://github.com/AcademySoftwareFoundation/openexr/commit/85009d840cc085aa96ad03ae76fa6463defeb0e5 cve-icon cve-icon
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-fw66-6xph-56jm cve-icon cve-icon cve-icon
History

Tue, 25 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Mon, 24 Aug 2026 22:15:00 +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 3.4.13, a crafted HTJ2K-compressed EXR can crash OpenEXR during normal decode. An HTJ2K-compressed EXR whose JPEG 2000 SIZ fields place the first tile outside the visible image can reach invalid tile and codeblock geometry in the vendored OpenJPH AVX2 decoder, causing a stack out-of-bounds write and denial of service. OpenEXR's HTJ2K path validates the decoded codestream dimensions against the EXR chunk size, but it does not reject SIZ image-offset/tile-grid geometry where the first tile does not intersect the image. This issue is fixed in version 3.4.14.
Title OpenEXR: HTJ2K SIZ image-offset gap stack buffer overflow
Weaknesses CWE-121
CWE-787
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-25T14:25:11.590Z

Reserved: 2026-07-30T16:19:08.082Z

Link: CVE-2026-68516

cve-icon Vulnrichment

Updated: 2026-08-25T14:24:45.826Z

cve-icon NVD

Status : Received

Published: 2026-08-24T22:17:19.340

Modified: 2026-08-25T15:16:37.477

Link: CVE-2026-68516

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-24T23:15:04Z

Weaknesses