TLS Connection Deadlock Vulnerability in Go Programming Language
CVE-2026-32283

7.5HIGH

Key Information:

Vendor

Go Standard Library

Status
Crypto/tls
Vendor
CVE Published:
8 April 2026

What is CVE-2026-32283?

A vulnerability exists in the Go programming language related to TLS 1.3, where sending multiple key update messages in a single record after the handshake can cause the connection to deadlock. This results in uncontrolled resource consumption, potentially leading to denial of service conditions. Developers using Go's TLS functionality should be aware of this issue to prevent service interruptions.

Affected Version(s)

crypto/tls 0 < 1.25.9

crypto/tls 1.26.0-0 < 1.26.2

References

https://go.dev/cl/763767
https://go.dev/issue/78334
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jakub Ciolek - https://ciolek.dev/
.