Use After Free in Academysoftwarefoundation Openexr
CVE-2025-64183
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.
Vulnerability class: Use-After-Free
EPSS: 0.003 (22.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Academysoftwarefoundation Openexr — versions >= 3.2.0, < 3.2.5, >= 3.3.0, < 3.3.6, >= 3.4.0, < 3.4.3
- Openexr
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-64183?
- CVE-2025-64183 is a high-severity vulnerability in Academysoftwarefoundation Openexr, classified under Use After Free. CVSS score: 7.5/10. Published 2025-11-10.
- How severe is CVE-2025-64183?
- High severity. CVSS v3 base score is 7.5 out of 10.