CVE-2026-56865: Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog

Overview

Severity

High (CVSS 8.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-20

EPSS Score

0.11% (percentile: 1.3%)

Affected Products (5)

Other

• 18315-17084
• 21660-17084
• 21021-17084
• 21676-17084
• 19693-17084

Revision History

• 2026-08-20: Information published.