# CVE-2026-34380: openexr: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for t...

CVE-2026-34380 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: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-34380
- Priority: Routine
- CVSS: 5.9 (medium)
- EPSS: 0.0027
- 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 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. The expression (uint64_t)(w * 3) computes w * 3 as a signed 32-bit integer before casting to uint64_t. When w is large, this multiplication constitutes undefined behavior under the C standard. On tested builds (clang/gcc without sanitizers), two's-complement wraparound commonly occurs, and for specific values of w the wrapped result is a small positive integer, which may allow the subsequent bounds check to pass incorrectly. If the check is bypassed, the decoding loop proceeds to write pixel data through dout, potentially extending far beyond the allocated output buffer. 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-2026-34380](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34380.md) | Apr 6, 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 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 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-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 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 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-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 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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