# CVE-2026-34588: openexr: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for t... CVE-2026-34588 is fixed in 7 products on 1 platform, first by libopenexr-3-1-30 3.1.5-5.1ubuntu0.1~esm1, released April 6, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-34588 - Priority: High - CVSS: 8.8 (high) - EPSS: 0.0050 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 6, 2026 ## Description OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libopenexr-3-1-30 Ubuntu 24.04.5 LTS (noble) | 3.1.5-5.1ubuntu0.1~esm1 | [libopenexr-3-1-30 3.1.5-5.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libopenexr-3-1-30-3.1.5-5.1ubuntu0.1-esm1.md) | Apr 6, 2026 | | Linux | libopenexr-3-1-30 Ubuntu 26.04.1 LTS (resolute) | 3.1.13-2ubuntu0.26.04.1~esm1 | [libopenexr-3-1-30 3.1.13-2ubuntu0.26.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libopenexr-3-1-30-3.1.13-2ubuntu0.26.04.1-esm1.md) | Apr 6, 2026 | | Linux | openexr Debian 14 | 3.4.14-0.1 | [DEBIAN-CVE-2026-34588](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34588.md) | Apr 6, 2026 | | Linux | openexr RHEL 10 | 3.1.10-8.el10_0.2 | [RHSA-2026:17656](https://patchblox.com/security/data/fix/linux/rhsa-2026-17656.md) | Apr 6, 2026 | | Linux | openexr RHEL 9 | 0:3.1.1-3.el9_8.2 | [RHSA-2026:19359](https://patchblox.com/security/data/fix/linux/rhsa-2026-19359.md) | May 15, 2026 | | Linux | openexr Ubuntu 24.04.5 LTS (noble) | 3.1.5-5.1ubuntu0.1~esm1 | [openexr 3.1.5-5.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openexr-3.1.5-5.1ubuntu0.1-esm1.md) | Apr 6, 2026 | | Linux | openexr Ubuntu 26.04.1 LTS (resolute) | 3.1.13-2ubuntu0.26.04.1~esm1 | [openexr 3.1.13-2ubuntu0.26.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openexr-3.1.13-2ubuntu0.26.04.1-esm1.md) | Apr 6, 2026 | | Linux | openexr almalinux 10 | 3.1.10-8.el10_2.2 | [ALSA-2026:19146](https://patchblox.com/security/data/fix/linux/alsa-2026-19146.md) | May 19, 2026 | | Linux | openexr almalinux 9 | 3.1.1-3.el9_8.2 | [ALSA-2026:19359](https://patchblox.com/security/data/fix/linux/alsa-2026-19359.md) | May 19, 2026 | | Linux | openexr amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | | Linux | openexr ol 10 | 0:3.1.10-8.el10_1.2 | [ELSA-2026-15888](https://patchblox.com/security/data/fix/linux/elsa-2026-15888.md) | May 11, 2026 | | Linux | openexr ol 9 | 0:3.1.1-3.el9_7.2 | [ELSA-2026-15887](https://patchblox.com/security/data/fix/linux/elsa-2026-15887.md) | May 11, 2026 | | Linux | openexr opensuse-leap 16.0 | 3.2.2-160000.6.1 | [OPENSUSE-SU-2026:20605-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20605-1.md) | Apr 22, 2026 | | Linux | openexr rocky 10 | 0:3.1.10-8.el10_2.2 | [RLSA-2026:19146](https://patchblox.com/security/data/fix/linux/rlsa-2026-19146.md) | May 29, 2026 | | Linux | openexr rocky 9 | 0:3.1.1-3.el9_7.2 | [RLSA-2026:19359](https://patchblox.com/security/data/fix/linux/rlsa-2026-19359.md) | May 20, 2026 | | Linux | openexr-debuginfo amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | | Linux | openexr-debugsource amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | | Linux | openexr-devel RHEL 9 | 0:3.1.1-3.el9_8.2 | [RHSA-2026:19359](https://patchblox.com/security/data/fix/linux/rhsa-2026-19359.md) | May 15, 2026 | | Linux | openexr-devel almalinux 10 | 3.1.10-8.el10_2.2 | [ALSA-2026:19146](https://patchblox.com/security/data/fix/linux/alsa-2026-19146.md) | May 19, 2026 | | Linux | openexr-devel almalinux 9 | 3.1.1-3.el9_8.2 | [ALSA-2026:19359](https://patchblox.com/security/data/fix/linux/alsa-2026-19359.md) | May 19, 2026 | | Linux | openexr-devel amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | | Linux | openexr-devel ol 10 | 0:3.1.10-8.el10_1.2 | [ELSA-2026-15888](https://patchblox.com/security/data/fix/linux/elsa-2026-15888.md) | May 11, 2026 | | Linux | openexr-devel ol 9 | 0:3.1.1-3.el9_7.2 | [ELSA-2026-15887](https://patchblox.com/security/data/fix/linux/elsa-2026-15887.md) | May 11, 2026 | | Linux | openexr-libs RHEL 9 | 0:3.1.1-3.el9_8.2 | [RHSA-2026:19359](https://patchblox.com/security/data/fix/linux/rhsa-2026-19359.md) | May 15, 2026 | | Linux | openexr-libs almalinux 10 | 3.1.10-8.el10_2.2 | [ALSA-2026:19146](https://patchblox.com/security/data/fix/linux/alsa-2026-19146.md) | May 19, 2026 | | Linux | openexr-libs almalinux 9 | 3.1.1-3.el9_8.2 | [ALSA-2026:19359](https://patchblox.com/security/data/fix/linux/alsa-2026-19359.md) | May 19, 2026 | | Linux | openexr-libs amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | | Linux | openexr-libs ol 10 | 0:3.1.10-8.el10_1.2 | [ELSA-2026-15888](https://patchblox.com/security/data/fix/linux/elsa-2026-15888.md) | May 11, 2026 | | Linux | openexr-libs ol 9 | 0:3.1.1-3.el9_7.2 | [ELSA-2026-15887](https://patchblox.com/security/data/fix/linux/elsa-2026-15887.md) | May 11, 2026 | | Linux | openexr-libs-debuginfo amzn 2023 | 3.1.5-1.amzn2023.0.9 | [ALAS2023-2026-1612](https://patchblox.com/security/data/fix/linux/alas2023-2026-1612.md) | Apr 27, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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