CVE-2026-34543
OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl)
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.
INFO
Published Date :
April 1, 2026, 9:17 p.m.
Last Modified :
April 7, 2026, 8:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update OpenEXR to version 3.4.8 or later.
- Ensure the EXR parsing library is updated.
- Validate file integrity after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34543.
| URL | Resource |
|---|---|
| https://github.com/AcademySoftwareFoundation/openexr/commit/5f6d0aaa9e43802917af7db90f181e88e083d3b8 | Patch |
| https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8 | Product Release Notes |
| https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432 | Exploit Vendor Advisory |
| https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34543 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34543
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34543 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34543 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* versions from (including) 3.4.0 up to (excluding) 3.4.8 *cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* versions from (including) 3.2.0 up to (excluding) 3.2.7 *cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* versions from (including) 3.3.0 up to (excluding) 3.3.9 Added Reference Type GitHub, Inc.: https://github.com/AcademySoftwareFoundation/openexr/commit/5f6d0aaa9e43802917af7db90f181e88e083d3b8 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8 Types: Product, Release Notes Added Reference Type CISA-ADP: https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 02, 2026
Action Type Old Value New Value Added Reference https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432 -
New CVE Received by [email protected]
Apr. 01, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-908 Added Reference https://github.com/AcademySoftwareFoundation/openexr/commit/5f6d0aaa9e43802917af7db90f181e88e083d3b8 Added Reference https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8 Added Reference https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-vc68-257w-m432