CVE-2026-39853: osslsigncode has a Stack Buffer Overflow via Unbounded Digest Copy During Signature Verification

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-12

EPSS Score

0.01% (percentile: 2.5%)

Affected Products (1)

Other

• 21087-17086

Revision History

• 2026-04-12: Information published.