CVE-2026-39831

CRITICAL EPSS 29.2%
Published May 22, 20261mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Critical
Find Similar
Published May 22, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
29.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-862 Missing Authorization Authorization

Affected Products 1

VendorProductVersionRange
golangcrypto* <0.52.0

References 4

  • go.dev https://go.dev/cl/781662
    Issue Tracking
  • go.dev https://go.dev/issue/79566
    Issue Tracking
  • groups.google.com https://groups.google.com/g/golang-announce/c/a082jnz-LvI
    Mailing List
  • pkg.go.dev https://pkg.go.dev/vuln/GO-2026-5019
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.