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

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

CVSS:3.1/AV:N/AC:H/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

EPSS Score

0.01% (percentile: 0.5%)

Affected Products (11)

Other

• 20688-17086
• 18315-17084
• 20519-17086
• 20387-17086
• 21113-17084
• 21116-17084
• 21117-17086
• 19668-17086
• 21021-17084

Open Source Software

• cbl2 python-tensorboard 2.11.0-3 on CBL Mariner 2.0
• azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0

Revision History

• 2026-04-11: Information published.