Integer overflow in OpenEXR - CVE-2026-40244
Published: April 20, 2026
Vulnerability identifier: #VU126523
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-40244
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenEXR
Affected software:
OpenEXR
OpenEXR
Detailed vulnerability description
The vulnerability allows a remote attacker to corrupt heap memory.
The vulnerability exists due to integer overflow in DWA setupChannelData planarUncRle pointer arithmetic when parsing a crafted EXR file. A remote attacker can supply a crafted DWAA/DWAB EXR file with large dimensions to corrupt heap memory.
User interaction is required to open the crafted file, and the issue is triggered on non-DCT channels, including UINT or single-channel layouts.
How to mitigate CVE-2026-40244
Install security update from vendor's website.