Medium 5.5Published Nov 10, 2025

CVE-2025-64183OpenEXR has use after free in PyObject_StealAttrString

Updated under an hour ago (Oct 26, 2026, 9:23 AM ET)

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Every CVE for AcademySoftwareFoundation openexr

Exploited in the last 30 days

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.2.0 through 3.2.4, 3.3.0 through 3.3.5, and 3.4.0 through 3.4.2, there is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp. The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.) Versions 3.2.5, 3.3.6, and 3.4.3 fix the issue.

CVSS: 5.5 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Nov 14, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AcademySoftwareFoundation openexr academysoftwarefoundation:openexr (from the name)	from 3.2.0, < 3.2.5; from 3.3.0, < 3.3.6; from 3.4.0, < 3.4.3	CNA record
openexr openexr openexr:openexr	from 3.2.0 before 3.2.5; from 3.3.0 before 3.3.6; from 3.4.0 before 3.4.3	NVD

References

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-57cw-j6vp-2p9mx-refsource-confirm, exploit, vendor-advisory
https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115x-refsource-misc, product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.