CVE-2026-39855: osslsigncode has an Integer Underflow in PE Page Hash Calculation Can Cause Out-of-Bounds Read

Overview

Severity

Medium (CVSS 5.5)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-12

EPSS Score

0.02% (percentile: 4.4%)

Affected Products (1)

Other

• 21087-17086

Revision History

• 2026-04-12: Information published.