High 8.4Published Apr 20, 2026

CVE-2026-40250OpenEXR has integer overflow in DWA decoder outBufferEnd pointer arithmetic (missed variant of CVE-2026-34589)

Updated under an hour ago (Oct 27, 2026, 8:30 AM ET)

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It affects AcademySoftwareFoundation openexr and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for AcademySoftwareFoundation openexr

Exploited in the last 30 days

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:1040` performs `chan->width * chan->bytes_per_element` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other decoders by CVE-2026-34589/34588/34544, 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:1040`.

CVSS: 8.4 HIGH (v4.0, 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
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AcademySoftwareFoundation openexr academysoftwarefoundation:openexr (from the name)	from 3.2.0, < 3.2.8; from 3.3.0, < 3.3.10; from 3.4.0, < 3.4.10	CNA record
openexr openexr openexr: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	NVD

References

References

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-m5qw-23x2-6phj	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.8	x-refsource-misc, product, release-notes
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.10	x-refsource-misc, product, release-notes
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.10	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.