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Security Advisories

GO-2026-6607

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

Severity

Unknown
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Summary

Reject malformed ECH outer extension references in crypto/tls

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.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-97031
  • https://github.com/advisories/GHSA-hq7w-2xrq-wp2j
  • https://pkg.go.dev/vuln/GO-2026-6607
  • https://go.dev/cl/847312
  • https://go.dev/issue/81855
  • https://groups.google.com/g/golang-announce/c/U2fTuyDJznI

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