CVE-2026-6276: stale custom cookie host causes cookie leak

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-05-14

Last Updated

2026-06-13

EPSS Score

0.29% (percentile: 20.7%)

Affected Products (7)

Open Source Software

• azl3 curl 8.11.1-6 on Azure Linux 3.0
• azl3 cmake 3.30.3-13 on Azure Linux 3.0
• azl3 rust 1.75.0-28 on Azure Linux 3.0
• azl3 rust 1.90.0-7 on Azure Linux 3.0

Other

• 21270-17084
• 21021-17084
• 21382-17084

Revision History

• 2026-05-14: Information published.
• 2026-05-19: Information published.
• 2026-05-26: Information published.
• 2026-06-03: Information published.
• 2026-06-13: Information published.