CVE-2026-32283

HIGH

Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls

Title source: cna

Description

If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.

References (4)

https://go.dev/cl/763767

https://go.dev/issue/78334

https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

https://pkg.go.dev/vuln/GO-2026-4870

Scores

CVSS v3 7.5

EPSS 0.0002

EPSS Percentile 4.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-770

Status published

Products (3)

Go standard library/crypto/tls < 1.25.9

Go standard library/crypto/tls 1.26.0-0 - 1.26.2

golang/go < 1.25.9

Published Apr 08, 2026

Tracked Since Apr 08, 2026