--- title: "CVE-2026-63638: OpenImageIO - Out of Bounds Read/Write" description: "OpenImageIO < 3.0.21.0, < 3.1.16.0, and < 3.2.0.3-beta1 contain a heap out-of-bounds write caused by improper bit depth handling in cineoninput::read_native_scanline, letting attackers cause memory corruption remotely, exploit requires crafted cineon image." url: https://panop.io/threat-heartbeat/CVE-2026-63638/ --- # CVE-2026-63638 OpenImageIO - Out of Bounds Read/Write OpenImageIO < 3.0.21.0, < 3.1.16.0, and < 3.2.0.3-beta1 contain a heap out-of-bounds write caused by improper bit depth handling in cineoninput::read\_native\_scanline, letting attackers cause memory corruption remotely, exploit requires crafted cineon image. CVSS base score 8.3 /10 High CISA KEV Not listed Public exploit Proof of concept available Authentication Not required EPSS 0.46% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-63638) ## Details Type Out of Bounds Read/Write CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H Published 18 September 2026 Updated 15 October 2026 Weakness [CWE-787](https://cwe.mitre.org/data/definitions/787.html) ## Vendor fix Update to versions 3.0.21.0, 3.1.16.0, or 3.2.0.3-beta1 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-63638](https://nvd.nist.gov/vuln/detail/CVE-2026-63638) - [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6f2b2e85b3b3933ccc5a46303d5535f99bfa39fb](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6f2b2e85b3b3933ccc5a46303d5535f99bfa39fb) - [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5283](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5283) - [https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0](https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0) - [https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0](https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0) - [https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-9hxv-jvgr-3x8g](https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-9hxv-jvgr-3x8g) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)