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

Quick assessment

Affected
AcademySoftwareFoundation openexr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenEXR是Academy Software Foundation开源的一种高动态范围图像（HDR）文件格式的开放标准。 OpenEXR 3.2.0版本至3.2.4版本、3.3.0版本至3.3.5版本和3.4.0版本至3.4.2版本存在资源管理错误漏洞，该漏洞源于pyOpenEXR_old.cpp中PyObject_StealAttrString存在释放后重用问题。

AI Predicted 8.8 Difficulty: Moderate EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-64183

Vulnerability Information
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Vulnerability Title
OpenEXR has use after free in PyObject_StealAttrString
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
OpenEXR 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenEXR是Academy Software Foundation开源的一种高动态范围图像（HDR）文件格式的开放标准。 OpenEXR 3.2.0版本至3.2.4版本、3.3.0版本至3.3.5版本和3.4.0版本至3.4.2版本存在资源管理错误漏洞，该漏洞源于pyOpenEXR_old.cpp中PyObject_StealAttrString存在释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AcademySoftwareFoundation openexr >= 3.2.0, < 3.2.5 -

II. Public POCs for CVE-2025-64183

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III. Intelligence Information for CVE-2025-64183

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Vendor Advisories for CVE-2025-64183 (1)

Same Patch Batch · AcademySoftwareFoundation · 2025-11-10 · 3 CVEs total

CVE-2025-64182 OpenEXR has buffer overflow in PyOpenEXR_old's channels() and channel()
CVE-2025-64181 OpenEXR Makes Use of Uninitialized Memory

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-416

V. Comments for CVE-2025-64183

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