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Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M

CVE-2026-34543OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl)

High 8.7

In plain English

A high-severity security flaw in openexr from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.22openexr3.3.11-r0ALPINE-CVE-2026-34543
Alpine:v3.23openexr3.4.13-r0ALPINE-CVE-2026-34543
Alpine:v3.24openexr3.4.10-r0ALPINE-CVE-2026-34543
Debian:12openexrno fix listedDEBIAN-CVE-2026-34543
Debian:13openexrno fix listedDEBIAN-CVE-2026-34543
Debian:14openexr3.4.14-0.1DEBIAN-CVE-2026-34543
PyPIopenexrno fix listedGHSA-vc68-257w-m432
PyPIopenexr3.4.8GHSA-vc68-257w-m432
PyPIopenexrno fix listedGHSA-vc68-257w-m432
PyPIopenexr3.4.8PYSEC-2026-2850
Ubuntu:26.10openexrno fix listedUBUNTU-CVE-2026-34543

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.8

Weakness: CWE-908 · Vector: 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

References