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Golang.org/X/Crypto/Ssh (< 0.52.0)

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critical threat

golang.org/x/crypto/ssh FIDO/U2F Physical Presence Bypass (CVE-2026-39831)

A critical vulnerability (CVE-2026-39831) in the `Verify()` method of the `golang.org/x/crypto/ssh` package (versions prior to 0.52.0) allowed the physical presence check for FIDO/U2F security key types to be bypassed, enabling unattended use of hardware security keys and potentially leading to unauthorized SSH access.

exploited golang.org/x/crypto/ssh ssh vulnerability golang fido u2f
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