Vulnerability Description
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D<Rgba> tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/AcademySoftwareFoundation/openexr/commit/71907b44ce9a1b05bf39
- https://github.com/AcademySoftwareFoundation/openexr/commit/904141d3a1f86327ad1e
- https://github.com/AcademySoftwareFoundation/openexr/commit/b1a5887372772d79328f
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f6
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f6
FAQ
What is CVE-2026-59186?
CVE-2026-59186 is a vulnerability with a CVSS score of 7.1 (HIGH). OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.1...
How severe is CVE-2026-59186?
CVE-2026-59186 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59186?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.