CVE-2026-97031

high

Description

Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

References

https://pkg.go.dev/vuln/GO-2026-6607

https://groups.google.com/g/golang-announce/c/U2fTuyDJznI

https://go.dev/issue/81855

https://go.dev/cl/847312

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95422

Details

Source: Mitre, NVD

Published: 2026-10-08

Updated: 2026-10-09

Named Vulnerability: GO-2026-6607Named Vulnerability: GHSA-hq7w-2xrq-wp2j

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: 0.00519