CVE-2026-34588OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry.
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-125, CWE-190, CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
openexr openexr openexr:openexr | from 3.1.0 before 3.2.7; from 3.3.0 before 3.3.9; from 3.4.0 before 3.4.9 | NVD |
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7product, release-notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9product, release-notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9product, release-notes
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hfexploit, mitigation, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:15887
- https://access.redhat.com/errata/RHSA-2026:15888
- https://access.redhat.com/errata/RHSA-2026:17656
- https://access.redhat.com/errata/RHSA-2026:17658
- https://access.redhat.com/errata/RHSA-2026:17659
- https://access.redhat.com/errata/RHSA-2026:17660
- https://access.redhat.com/errata/RHSA-2026:19146
- https://access.redhat.com/errata/RHSA-2026:19359
- https://access.redhat.com/errata/RHSA-2026:19587
- https://access.redhat.com/errata/RHSA-2026:30078
- https://access.redhat.com/errata/RHSA-2026:30087
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/security/cve/CVE-2026-34588
- https://bugzilla.redhat.com/show_bug.cgi?id=2455408
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.