CVE-2026-34544
HIGH7.3EPSS 0.01%OpenEXR: integer overflow to OOB write in uncompress_b44_impl()
Published: 4/3/2026Modified: 4/28/2026
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.
Affected packages (2)
- Debian/openexrfrom 0
- PyPI/openexr>= 3.4.0, < 3.4.8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-34544
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-34544
- PATCHhttps://github.com/AcademySoftwareFoundation/openexr
- WEBhttps://github.com/AcademySoftwareFoundation/openexr/commit/35e7aa35e22c1975606be86e859f31cc1fc598ee
- WEBhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8
- WEBhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-h762-rhv3-h25v