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, 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.
Affected products
openexr: openexr
References7
- github.com/AcademySoftwareFoundation/openexr/security/advisorie… ExploitVendor Advisory
- github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7 ProductRelease Notes
- github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9 ProductRelease Notes
- github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9 ProductRelease Notes
- access.redhat.com/security/cve/CVE-2026-34589
- bugzilla.redhat.com/show_bug.cgi?id=2455411
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34589…
Metrics
- CVSS 3.1
-
5.0
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H - CVSS 4.0
-
8.4
HIGH
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 37 · as of 12 November 2026
- CWE
- CWE-190CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.