What’s Vulnerable › Vulnerabilities

CVE-2026-68516: OpenEXR: HTJ2K SIZ image-offset gap stack buffer overflow

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-12
• Weakness: CWE-121

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.

Affected products

• AcademySoftwareFoundation openexr: from 3.4.0, < 3.4.14

References

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

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