CVE-2026-39831CRITICAL 9.1EPSS p22.4%

CVE-2026-39831CVE-2026-39831

golang / crypto

Description

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.31% probability of exploitation · percentile 22.4% · 2026-06-18T12:00:27Z
Published2026-05-22
Last modified2026-06-02

References

  1. https://go.dev/cl/781662
  2. https://go.dev/issue/79566
  3. https://groups.google.com/g/golang-announce/c/a082jnz-LvI
  4. https://pkg.go.dev/vuln/GO-2026-5019

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.