# CVE-2026-55373: openexr: OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture... CVE-2026-55373 is fixed in 13 products on 1 platform, first by SUSE-SU-2026:22653-1, released July 14, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-55373 - Priority: Routine - CVSS: 6.2 (medium) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 14, 2026 ## Description OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12, and 3.4.13 contain an infinite-loop vulnerability in SampleCountChannel. The helper roundListSizeUp() rounds a sample-list size up to the next power of two using repeated unsigned left shifts, which terminates for normal values but fails for UINT_MAX: the sequence reaches 0x80000000, and the next left shift wraps the 32-bit value to 0. Because 0 remains less than UINT_MAX, the loop never progresses and never exits. The bug is reachable through public OpenEXRUtil APIs, either by editing the sample-count buffer through SampleCountChannel::Edit (whose destructor calls endEdit()) or by calling SampleCountChannel::set(x, y, UINT_MAX) on a valid pixel. This issue has been fixed in versions 3.2.10, 3.3.12, and 3.4.13. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | mingw-openexr Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw32-openexr Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw32-openexr-debuginfo Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw32-openexr-tools Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw64-openexr Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw64-openexr-debuginfo Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | mingw64-openexr-tools Fedora 43 | 3.3.14-1.fc43 | [FEDORA-2026-BCC9AC580D](https://patchblox.com/security/data/fix/linux/fedora-2026-bcc9ac580d.md) | Aug 25, 2026 | | Linux | openexr Debian 14 | 3.4.14-0.1 | [DEBIAN-CVE-2026-55373](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55373.md) | Aug 28, 2026 | | Linux | openexr amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | | Linux | openexr opensuse-leap 16.0 | 3.2.2-160000.9.1 | [OPENSUSE-SU-2026:21336-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21336-1.md) | Jul 14, 2026 | | Linux | openexr sles 15.7 | 2.2.1-150000.3.52.1 | [SUSE-SU-2026:3169-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3169-1.md) | Jul 21, 2026 | | Linux | openexr sles 16.0 | 3.2.2-160000.9.1 | [SUSE-SU-2026:22653-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22653-1.md) | Jul 14, 2026 | | Linux | openexr-debuginfo amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | | Linux | openexr-debugsource amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | | Linux | openexr-devel amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | | Linux | openexr-libs amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | | Linux | openexr-libs-debuginfo amzn 2023 | 3.1.5-1.amzn2023.0.12 | [ALAS2023-2026-2154](https://patchblox.com/security/data/fix/linux/alas2023-2026-2154.md) | Sep 14, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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