Vulnerability · Published May 14, 2026 · Assigned by GitHub_M
CVE-2026-43996OpenImageIO: Integer wraparound in bounds check of decode_pixel leads to out-of-bounds read in TGA paletted image decoder
Medium 5.5
In plain English
A medium-severity out-of-bounds read in OpenImageIO from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | openimageio | no fix listed | DEBIAN-CVE-2026-43996 |
| Debian:14 | openimageio | 3.1.18.0+dfsg-2 | DEBIAN-CVE-2026-43996 |
| Ubuntu:22.04:LTS | openimageio | no fix listed | UBUNTU-CVE-2026-43996 |
| Ubuntu:25.10 | openimageio | no fix listed | UBUNTU-CVE-2026-43996 |
| Ubuntu:26.10 | openimageio | no fix listed | UBUNTU-CVE-2026-43996 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AcademySoftwareFoundation | OpenImageIO | < 3.0.18.0>= 3.1.4.0-beta, < 3.1.13.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H