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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-63419OpenImageIO: IFF ZBUFFER tile read writes past caller tile buffer

High 7.8

In plain English

A high-severity out-of-bounds write 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 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 87.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A zbuffer-only tiled iff is exposed with a 16-bit public imagespec while the decoder retains a 32-bit internal pixel size. iffinput::read_native_tile() copies according to m_header.pixel_bytes() rather than imagespec::tile_bytes(true), and a failed read can leave m_buf nonempty so a later call copies partially initialized data into the undersized caller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::read_native_tile(), ImageSpec::tile_bytes(true), m_header.pixel_bytes(), ZBUFFER, and m_buf, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12openimageiono fix listedDEBIAN-CVE-2026-63419
Debian:13openimageiono fix listedDEBIAN-CVE-2026-63419
Debian:14openimageio3.1.18.0+dfsg-2DEBIAN-CVE-2026-63419
Ubuntu:22.04:LTSopenimageiono fix listedUBUNTU-CVE-2026-63419
Ubuntu:26.10openimageiono fix listedUBUNTU-CVE-2026-63419

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation OpenImageIO < 3.0.21.0>= 3.1.0.0, < 3.1.16.0>= 3.2.0.0-dev, < 3.2.0.3-beta1

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References