CVE-2026-40244

Name: CVE-2026-40244
Creator: NVD / NIST
Published: 2026-04-21T02:16:08.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.4/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2026-40244 is a high-severity vulnerability rated 8.4/10 on the CVSS scale. 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. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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`.

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CVSS 4.0

8.4/10

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 Probability

0.45%

35.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Openexr	Openexr	>= 3.2.0, < 3.2.8
Openexr	Openexr	>= 3.3.0, < 3.3.10
Openexr	Openexr	>= 3.4.0, < 3.4.10

References

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.8Product, Release Notes
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.10Product, Release Notes
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.10Product, Release Notes
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-j526-66f6-fxhxMitigation, Vendor Advisory

Timeline

Published: Apr 21, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40244?

How severe is CVE-2026-40244?

CVE-2026-40244 has a CVSS score of 8.4/10 (HIGH severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40244?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40244?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST