CVE-2026-34589
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, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
- CVSS 4.0
- 8.4
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 - CVSS 3.1
- 5.0
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H - EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-26)
- CWEs
- CWE-190, CWE-787
- Published
- Modified
- Record from
- the NVD, synced
Affected
- openexr:openexr
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-p8xc-w3q4-h64x | PyPI | openexr | >=3.2.0 <3.2.7 | 3.2.7 |
| GHSA-p8xc-w3q4-h64x | PyPI | openexr | >=3.3.0 <3.3.9 | 3.3.9 |
| GHSA-p8xc-w3q4-h64x | PyPI | openexr | >=3.4.0 <3.4.9 | 3.4.9 |
| PYSEC-2026-2848 | PyPI | openexr | >=3.2.0 <3.2.7 >=3.3.0 <3.3.9 >=3.4.0 <3.4.9 | 3.2.7, 3.3.9, 3.4.9 |
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x
- https://access.redhat.com/security/cve/CVE-2026-34589