CVE-2026-97031

UNKNOWN 0.0

Reject malformed ECH outer extension references in crypto/tls

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go standard library
Product	crypto/tls
Published	Oct 8, 2026

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Affected Versions

Go standard library / crypto/tls

0 < 1.26.9 1.27.0-0 < 1.27.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/847312 go.dev: https://go.dev/issue/81855 groups.google.com: https://groups.google.com/g/golang-announce/c/U2fTuyDJznI pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6607