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CVE-2026-44663— OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow

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.

AcademySoftwareFoundation openexr是AcademySoftwareFoundation基金会的图像处理库。 AcademySoftwareFoundation openexr 3.4.0版本至3.4.11版本存在数字错误漏洞，该漏洞源于src/lib/OpenEXRCore/internal_ht.cpp中的ht_undo_impl()函数存在整数溢出，可能导致解析特制HTJ2K压缩EXR文件时触发堆缓冲区溢出。

CVSS 6.1 · Medium EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.11 affected
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I. Basic Information for CVE-2026-44663

Vulnerability Information
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Vulnerability Title
OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow
Source: CVE Program / CVE List V5
Vulnerability Description
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode->channels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., >= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
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
AcademySoftwareFoundation openexr 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AcademySoftwareFoundation openexr是AcademySoftwareFoundation基金会的图像处理库。 AcademySoftwareFoundation openexr 3.4.0版本至3.4.11版本存在数字错误漏洞，该漏洞源于src/lib/OpenEXRCore/internal_ht.cpp中的ht_undo_impl()函数存在整数溢出，可能导致解析特制HTJ2K压缩EXR文件时触发堆缓冲区溢出。
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 >= 3.4.0, < 3.4.11 -

II. Public POCs for CVE-2026-44663

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III. Intelligence Information for CVE-2026-44663

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Patches & Fixes for CVE-2026-44663 (1)

Vendor Advisories for CVE-2026-44663 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44663

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