CVE-2026-43996— OpenImageIO: Integer wraparound in bounds check of decode_pixel leads to out-of-bounds read in TGA paletted image decoder
Quick assessment
Affected
AcademySoftwareFoundation OpenImageIO
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.
OpenImageIO是OpenImageIO开源的一个图像处理库。具有易于使用的界面和大量受支持的图像格式。 OpenImageIO 3.0.18.0之前版本和3.1.13.0之前版本存在缓冲区错误漏洞，该漏洞源于TGAInput::decode_pixel中边界检查计算k+palbytespp时使用无符号32位算术，当k=0xFFFFFFFC且palbytespp=4时加法回绕为0，导致后续调色板访问使用未回绕的k值，读取约4GB内存并触发段错误。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AcademySoftwareFoundation | OpenImageIO | < 3.0.18.0 |
affected |
>= 3.1.4.0-beta, < 3.1.13.0 |
affected |
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I. Basic Information for CVE-2026-43996
Vulnerability Information
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Vulnerability Title
OpenImageIO: Integer wraparound in bounds check of decode_pixel leads to out-of-bounds read in TGA paletted image decoder
Source: CVE Program / CVE List V5
Vulnerability Description
OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.18.0 and 3.1.13.0, the bounds check in TGAInput::decode_pixel computes k + palbytespp as unsigned 32-bit arithmetic. When k = 0xFFFFFFFC and palbytespp = 4, the addition wraps to 0, which compares less than palette_alloc_size and passes the check. The subsequent palette access uses the unwrapped k (0xFFFFFFFC) as the index, reading ~4 GB past the start of the palette buffer — SEGV. This vulnerability is fixed in 3.0.18.0 and 3.1.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OpenImageIO 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenImageIO是OpenImageIO开源的一个图像处理库。具有易于使用的界面和大量受支持的图像格式。 OpenImageIO 3.0.18.0之前版本和3.1.13.0之前版本存在缓冲区错误漏洞，该漏洞源于TGAInput::decode_pixel中边界检查计算k+palbytespp时使用无符号32位算术，当k=0xFFFFFFFC且palbytespp=4时加法回绕为0，导致后续调色板访问使用未回绕的k值，读取约4GB内存并触发段错误。
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 | OpenImageIO | < 3.0.18.0 | - |
|
II. Public POCs for CVE-2026-43996
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-43996 (1)
Same Patch Batch · AcademySoftwareFoundation · 2026-05-14 · 8 CVEs total
| CVE-2026-43908 | 8.8 HIGH | OpenImageIO: Signed integer overflow in ConvertCbYCrYToRGB leads to heap out-of-bounds wri |
| CVE-2026-43909 | 8.8 HIGH | OpenImageIO: Signed integer overflow in SwapRGBABytes loop index leads to out-of-bounds re |
| CVE-2026-43907 | 8.3 HIGH | OpenImageIO: Integer overflow in QueryRGBBufferSizeInternal leads to heap out-of-bounds wr |
| CVE-2026-43903 | OpenImageIO: SGI RLE decoder heap buffer overflow OIIO_DASSERT bounds checks are no-ops in | |
| CVE-2026-43906 | OpenImageIO: HEIF Heap overflow | |
| CVE-2026-43904 | OpenImageIO: Softimage PIC RLE decoder heap buffer overflow — longCount not clamped to ima | |
| CVE-2026-43905 | OpenImageIO: JPEG2000 (OpenJPH) signed integer overflow in buffer allocation |
IV. Related Vulnerabilities
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-
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Same weakness: CWE-125
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