What is CVE-2026-34378?

CVE-2026-34378 is a medium-severity vulnerability in Academysoftwarefoundation Openexr, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-04-06.

How severe is CVE-2026-34378?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Integer overflow in Academysoftwarefoundation Openexr

CVE-2026-34378

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file hea…

Vulnerability class: Integer Overflow

EPSS: 0.001 (17.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Academysoftwarefoundation Openexr — versions >= 3.4.0, < 3.4.9

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g (x_refsource_CONFIRM)
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34378?: CVE-2026-34378 is a medium-severity vulnerability in Academysoftwarefoundation Openexr, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2026-04-06.
How severe is CVE-2026-34378?: Medium severity. CVSS v3 base score is 6.5 out of 10.