CVE-2026-56862

high

Description

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.

References

https://pkg.go.dev/vuln/GO-2026-6090

https://groups.google.com/g/golang-announce/c/94pEornpRlI

https://go.dev/issue/80528

https://go.dev/cl/804261

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-58511

Details

Source: Mitre, NVD

Published: 2026-08-13

Updated: 2026-09-03

Named Vulnerability: GO-2026-6090Named Vulnerability: GHSA-7qch-w8m5-g3h3

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00568