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Security Advisories

GO-2026-4870

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

Severity

7.5

High

CVSS V3

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Summary

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

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.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-32283
  • https://github.com/advisories/GHSA-jrg3-gfjw-hm96
  • https://pkg.go.dev/vuln/GO-2026-4870
  • https://go.dev/cl/763767
  • https://go.dev/issue/78334
  • https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

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