CVE-2026-63638: OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant

This month

HIGH 8.3UPGRADE

CVE-2026-63638 is a high-severity flaw (CVSS 8.3) affecting openimageio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 crafted cineon image can declare unsupported component bit depth 26. cineoninput::open() maps it to a 32-bit imagespec, but libcineon maps the unsupported depth to an 8-byte value, so cineoninput::read_native_scanline() causes attacker-controlled data to be written beyo

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-09-18
Last modified	2026-09-29

Publisher (CNA): GitHub, Inc. · Vendor: openimageio

Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-18 16:17 UTCPublished CVE record published
2026-09-29 18:55 UTCUpdated Record last modified

openimageio openimageio UPGRADE

Affected: < 3.0.21.0 · >= 3.1.0.0 and <= 3.1.16.0 · 3.2.0.0 dev · 3.2.0.2 dev

Fixed in: 3.0.21.0

Safe to downgrade to: a release before 3.1.0.0

1. Check installed version

apt-cache policy openimageio || rpm -q openimageio || openimageio --version

2. UPGRADE to 3.0.21.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openimageio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openimageio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.1.0.0 (Debian / Ubuntu)

apt-cache madison openimageio sudo apt install openimageio=<VERSION_BEFORE_3.1.0.0> sudo apt-mark hold openimageio

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openimageio sudo dnf downgrade openimageio-<VERSION_BEFORE_3.1.0.0> sudo dnf versionlock add openimageio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-63638?

openimageio: upgrade to 3.0.21.0. Exact commands for each OS are on this page.

Is CVE-2026-63638 being exploited?

CVE-2026-63638 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-63638 affect?

CVE-2026-63638 affects openimageio. Severity is high (CVSS 8.3). 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 crafted cineon image can declare unsupported component bit d

How urgent is CVE-2026-63638?

Priority 44/100. High severity; Public exploit reference

Related CVEs

CVE-2026-43908 HIGH 8.8 UPGRADE OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant
CVE-2026-43909 HIGH 8.8 UPGRADE OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant
CVE-2026-43904 HIGH 7.8 UPGRADE OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant
CVE-2026-43905 HIGH 7.8 UPGRADE OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant
CVE-2026-43906 HIGH 7.8 UPGRADE OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant

References

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