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CVE-2026-34545— OpenEXR: integer overflow lead to OOB in HTJ2K decoder

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至3.4.7之前版本存在输入验证错误漏洞，该漏洞源于攻击者提供具有HTJ2K压缩和通道宽度为32768的特制.exr文件，可以在解码EXR图像的任何应用程序中向输出堆缓冲区之外写入受控数据，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.74% · P53

Affected Version Matrix 1

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.7 affected
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I. Basic Information for CVE-2026-34545

Vulnerability Information
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Vulnerability Title
OpenEXR: integer overflow lead to OOB in HTJ2K decoder
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 version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.
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
堆缓冲区溢出
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至3.4.7之前版本存在输入验证错误漏洞，该漏洞源于攻击者提供具有HTJ2K压缩和通道宽度为32768的特制.exr文件，可以在解码EXR图像的任何应用程序中向输出堆缓冲区之外写入受控数据，可能导致远程代码执行。
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 >= 3.4.0, < 3.4.7 -

II. Public POCs for CVE-2026-34545

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III. Intelligence Information for CVE-2026-34545

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Patches & Fixes for CVE-2026-34545 (1)

Vendor Advisories for CVE-2026-34545 (1)

Vendor Pages for CVE-2026-34545 (1)

Same Patch Batch · AcademySoftwareFoundation · 2026-04-01 · 3 CVEs total

CVE-2026-34544 OpenEXR: integer overflow to OOB write in uncompress_b44_impl()
CVE-2026-34543 OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed siz

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-122

V. Comments for CVE-2026-34545

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