Vulnerability Report: GO-2026-5856
- CVE-2026-42505
- Affects: crypto/tls
- Published: Jul 07, 2026
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.
Affected Packages
-
PathVersionsSymbols
-
before go1.25.12, from go1.26.0-0 before go1.26.5, from go1.27.0-0 before go1.27.0-rc.2
Aliases
References
- https://go.dev/cl/775960
- https://go.dev/issue/79282
- https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc
- https://vuln.go.dev/ID/GO-2026-5856.json
Credits
- Coia Prant (github.com/rbqvq)
Feedback
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