CVE-2026-63638

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 39.9% of scored records. A rank, not a probability.

NVD base score

8.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-09-29.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-18 15:47Z1 MO AGO

Last updated

2026-09-22 14:48Z1 MO AGO

Reserved

2026-07-17

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.3)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

Weaknesses

• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

881cd05745eda32950346d05ae6556c1a36b7526e4873ade1dc3cba7c37019b3

• github.comhttps://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-9hxv-jvgr-3x8gx_refsource_CONFIRM
• github.comhttps://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5283x_refsource_MISC
• github.comhttps://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6f2b2e85b3b3933ccc5a46303d5535f99bfa39fbx_refsource_MISC
• github.comhttps://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0x_refsource_MISC
• github.comhttps://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0x_refsource_MISC