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CVE-2026-39831

Golang Crypto broken access control

9.1 CRITICALEPSS 0.49%
  1. Published22 May 2026

Description

The Verify() method for FIDO/U2F security key types ([email protected], [email protected]) 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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Golang Crypto< 0.52.0

Remediation

Fixed in
Golang Crypto≥ 0.52.0
Patch & vendor advisories

References

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Frequently asked

Is CVE-2026-39831 being actively exploited?

CVE-2026-39831 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.49%.

How severe is CVE-2026-39831?

CVE-2026-39831 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2026-39831?

Affected products include Golang Crypto.

How do I fix CVE-2026-39831?

Upgrade affected software to a fixed version, for example Golang Crypto 0.52.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39831 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.