CVE-2026-34543

Name: CVE-2026-34543
Creator: NVD / NIST
Published: 2026-04-01T21:17:01.32+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2026-34543 is a high-severity vulnerability rated 8.7/10 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. From version 3.4.0 to before version 3.4.8, sensitive information from heap memory may be leaked through the decoded pixel data (information disclosure). EPSS estimates a 0.48% 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. From version 3.4.0 to before version 3.4.8, sensitive information from heap memory may be leaked through the decoded pixel data (information disclosure). This occurs under default settings; simply reading a malicious EXR file is sufficient to trigger the issue, without any user interaction. This issue has been patched in version 3.4.8.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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

0.48%

37.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-908

Affected Software

Vendor	Product	Versions
Openexr	Openexr	>= 3.2.0, < 3.2.7
Openexr	Openexr	>= 3.3.0, < 3.3.9
Openexr	Openexr	>= 3.4.0, < 3.4.8

References

https://github.com/AcademySoftwareFoundation/openexr/commit/5f6d0aaa9e43802917af7db90f181e88e083d3b8Patch
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8Product, Release Notes
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432Exploit, Vendor Advisory
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432Exploit, Vendor Advisory

Timeline

Published: Apr 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34543?

How severe is CVE-2026-34543?

CVE-2026-34543 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34543?

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-2026-34543?

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

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Source: NVD / NIST