Vulnerability · Published May 14, 2026 · Assigned by GitHub_M
CVE-2026-43909OpenImageIO: Signed integer overflow in SwapRGBABytes loop index leads to out-of-bounds read/write in DPX ABGR decoder
High 8.8
In plain English
A high-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 0.4% (higher than 31% 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, a signed 32-bit integer overflow in the loop index expression i * 4 inside SwapRGBABytes() causes the function to compute a large negative pointer offset when processing kABGR DPX images with large dimensions. The immediate crash is an out-of-bounds read (the memcpy at line 45 reads from &input[i * 4] first), but the subsequent write operations at lines 46–49 target the same wrapped offset — making this a combined OOB read+write primitive. This vulnerability is fixed in 3.0.18.0 and 3.1.13.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | openimageio | no fix listed | DEBIAN-CVE-2026-43909 |
| Debian:13 | openimageio | no fix listed | DEBIAN-CVE-2026-43909 |
| Debian:14 | openimageio | 3.1.18.0+dfsg-2 | DEBIAN-CVE-2026-43909 |
| Ubuntu:22.04:LTS | openimageio | no fix listed | UBUNTU-CVE-2026-43909 |
| Ubuntu:25.10 | openimageio | no fix listed | UBUNTU-CVE-2026-43909 |
| Ubuntu:26.10 | openimageio | no fix listed | UBUNTU-CVE-2026-43909 |
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, CWE-190, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H