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Security Advisories

GO-2026-5856

https://pkg.go.dev/vuln/GO-2026-5856

Severity

5.3

Medium

CVSS V3

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Summary

Invoking Encrypted Client Hello privacy leak in crypto/tls

Description

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-42505
  • https://github.com/advisories/GHSA-ff52-ph69-cf7x
  • https://pkg.go.dev/vuln/GO-2026-5856
  • https://go.dev/cl/775960
  • https://go.dev/issue/79282
  • https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc

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