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/E:U

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-20

Last Updated

2026-09-24

EPSS Score

0.13% (percentile: 2.2%)

Affected Products (4)

Other

• 21660-17084
• 21676-17084
• 21778-17084
• 21857-17084

Security Updates (1)

• Security Update

Revision History

• 2026-08-20: Information published.
• 2026-09-03: Information published.
• 2026-09-05: Information published.
• 2026-09-09: Information published.
• 2026-09-17: Information published.
• 2026-09-24: Information published.