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CVE-2026-42217— OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.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 3.0.0版本至3.2.9之前版本、3.3.0版本至3.3.11之前版本和3.4.0版本至3.4.11之前版本存在输入验证错误漏洞，该漏洞源于readVariableLengthInteger()解码可变长度整数时未限制移位计数，可能导致未定义行为。

AI Predicted 5.3 Difficulty: Easy EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.0.0, < 3.2.9 affected
>= 3.3.0, < 3.3.11 affected
>= 3.4.0, < 3.4.11 affected
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I. Basic Information for CVE-2026-42217

Vulnerability Information
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Vulnerability Title
OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.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. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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 3.0.0版本至3.2.9之前版本、3.3.0版本至3.3.11之前版本和3.4.0版本至3.4.11之前版本存在输入验证错误漏洞，该漏洞源于readVariableLengthInteger()解码可变长度整数时未限制移位计数，可能导致未定义行为。
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 >= 3.0.0, < 3.2.9 -

II. Public POCs for CVE-2026-42217

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III. Intelligence Information for CVE-2026-42217

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Patches & Fixes for CVE-2026-42217 (2)

Vendor Advisories for CVE-2026-42217 (1)

Same Patch Batch · AcademySoftwareFoundation · 2026-05-07 · 3 CVEs total

CVE-2026-41142 8.8 HIGH OpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write
CVE-2026-42216 8.8 HIGH OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42217

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