CVE-2026-11525: undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching

Overview

Severity

Low (CVSS 3.7)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-27

Last Updated

2026-07-10

EPSS Score

0.24% (percentile: 13.4%)

Affected Products (1)

Other

• 21498-17084

Revision History

• 2026-06-27: Information published.
• 2026-06-28: Information published.
• 2026-06-30: Information published.
• 2026-07-10: Information published.