What’s Vulnerable › Vulnerabilities

CVE-2026-40244: OpenEXR has integer overflow in DWA setupChannelData planarUncRle pointer arithmetic (missed variant of CVE-2026-34589)

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-190

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, `internal_dwa_compressor.h:1722` performs `curc->width * curc->height` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other locations by the recent CVE-2026-34589 batch, but this line was missed. Versions 3.4.10, 3.3.10, and 3.2.8 contain a fix that addresses `internal_dwa_compressor.h:1722`.

Affected products

• AcademySoftwareFoundation openexr: from 3.2.0 before 3.2.8; from 3.3.0 before 3.3.10; from 3.4.0 before 3.4.10 — fixed in 3.2.8, 3.3.10, 3.4.10

How to fix

Upgrade to a fixed version: AcademySoftwareFoundation openexr 3.2.8, 3.3.10, 3.4.10. Check the vendor advisory for mitigations.

References

• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.8
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.10
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.10
• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-j526-66f6-fxhx
• https://access.redhat.com/security/cve/CVE-2026-40244
• https://bugzilla.redhat.com/show_bug.cgi?id=2459955
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40244.json

Get alerted when CVE-2026-40244 or the next vulnerability affects your stack