CVE-2026-32283

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go standard library
Product	crypto/tls
Published	Apr 8, 2026
Last Updated	Apr 13, 2026

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Affected Versions

Go standard library / crypto/tls

0 < 1.25.9 1.26.0-0 < 1.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/763767 go.dev: https://go.dev/issue/78334 groups.google.com: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4870

Credits

Jakub Ciolek - https://ciolek.dev/