CVE-2026-32283: Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls

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-Apr

Released

2026-04-11

Last Updated

2026-06-23

EPSS Score

0.62% (percentile: 45.6%)

Affected Products (15)

Other

• 21423-17084
• 21411-17084

Open Source Software

• cbl2 gcc 11.2.0-9 on CBL Mariner 2.0
• cbl2 golang 1.18.8-10 on CBL Mariner 2.0
• cbl2 golang 1.22.7-5 on CBL Mariner 2.0
• azl3 golang 1.25.8-1 on Azure Linux 3.0
• azl3 golang 1.26.1-1 on Azure Linux 3.0
• cbl2 msft-golang 1.25.8-1 on CBL Mariner 2.0
• cbl2 python-tensorboard 2.11.0-3 on CBL Mariner 2.0
• azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0
• cbl2 tensorflow 2.11.1-2 on CBL Mariner 2.0
• azl3 tensorflow 2.16.1-11 on Azure Linux 3.0
• azl3 golang 1.25.9-1 on Azure Linux 3.0
• azl3 golang 1.26.2-1 on Azure Linux 3.0

Mariner

• azl3 gcc 13.2.0-7 on Azure Linux 3.0

Revision History

• 2026-04-11: Information published.
• 2026-04-14: Information published.
• 2026-04-15: Information published.
• 2026-04-30: Information published.
• 2026-06-03: Information published.
• 2026-06-23: Information published.