CVE-2026-43996: academysoftwarefoundation openimageio Out-of-bounds Read
Vulnerability summary
CVE-2026-43996 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in academysoftwarefoundation openimageio. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.3% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 14-05-2026PublishedVulnerability first disclosed.
- 16-05-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
-0.02 pp
From 0.18% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundOpenimageio
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Academysoftwarefoundation1 product
- openimageio< 3.0.18.0 | ≥ 3.1.4.0-beta, < 3.1.13.0
Debian1 product
- openimageioAll versions (No fix recorded) | < 3.1.18.0+dfsg-2
Openimageio1 product
- openimageio< 3.0.18.0 | ≥ 3.1.0.0, < 3.1.13.0 | 3.2.0.0:dev | 3.2.0.2:dev
Ubuntu1 product
- openimageioAll versions (No fix recorded)
4 vendors · 4 products
References
4 links- github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-mq8j-73c4-cr55X Refsource CONFIRMREPORTExploitVendor Advisory
