CVE-2026-34543

HIGH

OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl)

Title source: cna

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.

References (3)

[X_Refsource_Confirm] https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432

[X_Refsource_Misc] https://github.com/AcademySoftwareFoundation/openexr/commit/5f6d0aaa9e43802917af7db90f181e88e083d3b8

View Writeup ZIP pw:eip

[X_Refsource_Misc] https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8

Scores

CVSS v3 7.5

EPSS 0.0004

EPSS Percentile 11.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-908

Status published

Products (3)

AcademySoftwareFoundation/openexr >= 3.4.0, < 3.4.8

openexr/openexr 3.2.0 - 3.2.7

pypi/openexr 3.4.0 - 3.4.8PyPI

Published Apr 01, 2026

Tracked Since Apr 02, 2026