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Fencer Vulns
high 8.8

CVE-2026-43909 json

OpenImageIO: Signed integer overflow in SwapRGBABytes loop index leads to out-of-bounds read/write in DPX ABGR decoder

published 2026-05-14 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-30415

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • openimageio openimageio 3.0.18.0, 3.1.13.0
  • openimageio Debian 14 3.1.18.0+dfsg-2

debian advisories DEBIAN-CVE-2026-43909

  • openimageio Ubuntu Pro 16.04 LTS 1.6.11~dfsg0-1ubuntu1+esm2
  • openimageio Ubuntu Pro 18.04 LTS 1.7.17~dfsg0-1ubuntu2+esm1
  • openimageio Ubuntu Pro 20.04 LTS 2.1.12.0~dfsg0-1ubuntu0.1~esm1
  • openimageio Ubuntu Pro 24.04 LTS 2.4.17.0+dfsg-1.1ubuntu0.1~esm1
  • openimageio Ubuntu Pro 26.04 LTS 2.5.19.1+dfsg-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-43909

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43909 updated cvss 8.8

OpenImageIO: OpenImageIO: Arbitrary code execution or denial of service via integer overflow in image processing

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-g267-j53j-5258 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • AcademySoftwareFoundation OpenImageIO

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.