Out-of-bounds write in OpenEXR - CVE-2026-55059
Published: June 23, 2026
Vulnerability identifier: #VU135036
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55059
CWE-ID: CWE-787
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 cause a denial of service.
The vulnerability exists due to out-of-bounds write in Imf_4_0::SampleCountChannel::set(int r, unsigned int newNumSamples[]) when processing row-based sample-count updates through the OpenEXRUtil DeepImage API. A remote attacker can trick the victim into opening a crafted file to cause a denial of service.
User interaction is required, and exploitation requires image data windows whose X and Y origins differ.
How to mitigate CVE-2026-55059
Install security update from vendor's website.