openexr: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for t...
CVE-2026-34378 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-34378, released April 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| openexr · Debian 14 | 3.4.14-0.1 | DEBIAN-CVE-2026-34378 | Apr 6, 2026 |
| openexr · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
| openexr-debuginfo · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
| openexr-debugsource · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
| openexr-devel · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
| openexr-libs · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
| openexr-libs-debuginfo · amzn 2023 | 3.1.5-1.amzn2023.0.9 | ALAS2023-2026-1612 | Apr 27, 2026 |
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