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Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M

CVE-2026-34545OpenEXR: integer overflow lead to OOB in HTJ2K decoder

High 8.8

In plain English

A high-severity heap buffer overflow in openexr from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.6%top 49.4% 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 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12openexrno fix listedDEBIAN-CVE-2026-34545
Debian:13openexrno fix listedDEBIAN-CVE-2026-34545
Debian:14openexr3.4.14-0.1DEBIAN-CVE-2026-34545
Ubuntu:26.10openexrno fix listedUBUNTU-CVE-2026-34545

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.7

Weakness: CWE-122, CWE-190, CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References