CVE-2026-26981— OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
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3.3.6版本和3.4.0版本至3.4.4版本存在安全漏洞，该漏洞源于解析畸形EXR文件时整数下溢，可能导致堆缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-26981
Vulnerability Information
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Vulnerability Title
OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
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 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
有符号至无符号转换错误
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3.3.6版本和3.4.0版本至3.4.4版本存在安全漏洞，该漏洞源于解析畸形EXR文件时整数下溢，可能导致堆缓冲区溢出。
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, < 3.3.7 | - |
|
II. Public POCs for CVE-2026-26981
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-26981 (1)
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V. Comments for CVE-2026-26981
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