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Vulnerability record · CVE-2026-59187 · published 25 August 2026

CVE-2026-59187: Heap-based buffer overflow vulnerability

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. OpenEXR versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13 are vulnerable to a heap out-of-bounds write when exrmetrics reads a crafted deep scanline EXR. This occurs with pixel conversion options such as --pixelmode float or --bench because DeepSlice requests FLOAT output while the backing sample buffers are allocated using the input HALF element size. The issue is fixed in versions 3.3.13 and 3.4.14.

7.1 CVSS 3.1 High EPSS 0.40% · top 68.2% CWE-122 · Heap-based buffer overflowCWE-787 · Out-of-bounds write Deferred
7.1CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Sep 2026Last modified by NVD

Description

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. OpenEXR versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13 are vulnerable to a heap out-of-bounds write when exrmetrics reads a crafted deep scanline EXR. This occurs with pixel conversion options such as --pixelmode float or --bench because DeepSlice requests FLOAT output while the backing sample buffers are allocated using the input HALF element size. The issue is fixed in versions 3.3.13 and 3.4.14.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

References

LinkTags
https://github.com/AcademySoftwareFoundation/openexr/commit/46e70220dc91dbc1341fac4671704e970b450585
https://github.com/AcademySoftwareFoundation/openexr/commit/7e772dd704b9b5d6dc2564647d89f7813f608e94
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-6jj8-cxcr-j8hm

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Source: NIST National Vulnerability Database (record CVE-2026-59187), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.