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CVE-2025-64181— OpenEXR Makes Use of Uninitialized Memory

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 3.3.0版本至3.3.5版本和3.4.0版本至3.4.2版本存在安全漏洞，该漏洞源于使用未初始化内存，可能导致未定义行为和拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-64181

Vulnerability Information
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Vulnerability Title
OpenEXR Makes Use of Uninitialized Memory
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 3.3.0 through 3.3.5 and 3.4.0 through 3.4.2, while fuzzing `openexr_exrcheck_fuzzer`, Valgrind reports a conditional branch depending on uninitialized data inside `generic_unpack`. This indicates a use of uninitialized memory. The issue can result in undefined behavior and/or a potential crash/denial of service. Versions 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:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的变量
Source: CVE Program / CVE List V5
Vulnerability Title
OpenEXR 安全漏洞
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 3.3.0版本至3.3.5版本和3.4.0版本至3.4.2版本存在安全漏洞，该漏洞源于使用未初始化内存，可能导致未定义行为和拒绝服务。
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 >= 3.3.0, < 3.3.6 -

II. Public POCs for CVE-2025-64181

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III. Intelligence Information for CVE-2025-64181

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

CVE-2025-64183 OpenEXR has use after free in PyObject_StealAttrString
CVE-2025-64182 OpenEXR has buffer overflow in PyOpenEXR_old's channels() and channel()

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-457

V. Comments for CVE-2025-64181

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