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CVE-2026-42216— OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion

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之前版本存在缓冲区错误漏洞，该漏洞源于IDManifest::init()重构前缀压缩字符串时未检查当前字符串至少有两个字节，可能导致越界读取。

CVSS 8.8 · High EPSS 0.71% · P52

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

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-2026-42216

Vulnerability Information
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Vulnerability Title
OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion
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, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. 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:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OpenEXR 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于IDManifest::init()重构前缀压缩字符串时未检查当前字符串至少有两个字节，可能导致越界读取。
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-2026-42216

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III. Intelligence Information for CVE-2026-42216

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Vendor Advisories for CVE-2026-42216 (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-2026-42217 OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.cpp`)

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-125

V. Comments for CVE-2026-42216

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