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CVE-2026-40244— OpenEXR has integer overflow in DWA setupChannelData planarUncRle pointer arithmetic (missed variant of CVE-2026-34589)

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 3.4.0版本至3.4.9版本、3.3.0版本至3.3.9版本和3.2.0版本至3.2.7版本存在输入验证错误漏洞，该漏洞源于internal_dwa_compressor.h:1722行在int32算术中执行curc->width * curc->height运算时未进行(size_t)强制转换，可能导致整数溢出。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 3

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.2.0, < 3.2.8 affected
>= 3.3.0, < 3.3.10 affected
>= 3.4.0, < 3.4.10 affected
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I. Basic Information for CVE-2026-40244

Vulnerability Information
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Vulnerability Title
OpenEXR has integer overflow in DWA setupChannelData planarUncRle pointer arithmetic (missed variant of CVE-2026-34589)
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 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, `internal_dwa_compressor.h:1722` performs `curc->width * curc->height` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other locations by the recent CVE-2026-34589 batch, but this line was missed. Versions 3.4.10, 3.3.10, and 3.2.8 contain a fix that addresses `internal_dwa_compressor.h:1722`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
OpenEXR 输入验证错误漏洞
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 3.4.0版本至3.4.9版本、3.3.0版本至3.3.9版本和3.2.0版本至3.2.7版本存在输入验证错误漏洞，该漏洞源于internal_dwa_compressor.h:1722行在int32算术中执行curc->width * curc->height运算时未进行(size_t)强制转换，可能导致整数溢出。
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 >= 3.2.0, < 3.2.8 -

II. Public POCs for CVE-2026-40244

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III. Intelligence Information for CVE-2026-40244

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Vendor Advisories for CVE-2026-40244 (1)

Same Patch Batch · AcademySoftwareFoundation · 2026-04-21 · 3 CVEs total

CVE-2026-39886 5.3 MEDIUM OpenEXR has HTJ2K Signed Integer Overflow in ht_undo_impl()
CVE-2026-40250 OpenEXR has integer overflow in DWA decoder outBufferEnd pointer arithmetic (missed varian

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-190

V. Comments for CVE-2026-40244

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