ssh: FIDO/U2F Physical Interaction Requirement Bypass

This CVE does not affect KrakenD

KrakenD does not implement or expose SSH functionality. The golang.org/x/crypto/ssh package is a transitive dependency but its SSH authentication code paths are never invoked during KrakenD operation. The dependency was upgraded as a precaution.

Addressed through routine dependency maintenance in CE 2.13.6 and EE 2.13.4.

Component

golang.org/x/crypto (SSH)

Disclosed

May 26, 2026

Description

Go’s golang.org/x/crypto/ssh client does not check the User Presence flag when using FIDO/U2F authentication keys. This allows bypassing the physical interaction requirement for FIDO/U2F keys, potentially enabling authentication without the required hardware button press.

References

View CVE-2026-39831 on Go Issue Tracker

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