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CVE-2026-34588— OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write

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 3.1.0至3.2.7之前版本、3.3.9之前版本和3.4.9之前版本存在缓冲区错误漏洞，该漏洞源于整数溢出可能导致越界读取和越界写入。

CVSS 8.6 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.1.0, <= 3.1.13 affected
>= 3.2.0, < 3.2.7 affected
>= 3.3.0, < 3.3.9 affected
>= 3.4.0, < 3.4.9 affected
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I. Basic Information for CVE-2026-34588

Vulnerability Information
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Vulnerability Title
OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write
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 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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 3.1.0至3.2.7之前版本、3.3.9之前版本和3.4.9之前版本存在缓冲区错误漏洞，该漏洞源于整数溢出可能导致越界读取和越界写入。
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 >= 3.1.0, <= 3.1.13 -

II. Public POCs for CVE-2026-34588

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III. Intelligence Information for CVE-2026-34588

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Vendor Advisories for CVE-2026-34588 (1)

Vendor Pages for CVE-2026-34588 (2)

Same Patch Batch · AcademySoftwareFoundation · 2026-04-06 · 5 CVEs total

CVE-2026-34379 7.1 HIGH OpenEXR has a misaligned write in LossyDctDecoder_execute leading to undefined behavior (D
CVE-2026-34378 6.5 MEDIUM OpenEXR has a signed integer overflow in generic_unpack() when parsing EXR files with craf
CVE-2026-34380 5.9 MEDIUM OpenEXR has a signed integer overflow (undefined behavior) in undo_pxr24_impl may allow bo
CVE-2026-34589 OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34588

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