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CVE-2026-39832

Golang Crypto insecure deserialization

9.1 CRITICALEPSS 0.72%
  1. Published22 May 2026

Description

When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

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

and 31 more references

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Frequently asked

Is CVE-2026-39832 being actively exploited?

CVE-2026-39832 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-39832?

CVE-2026-39832 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-39832?

Affected products include Golang Crypto.

How do I fix CVE-2026-39832?

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-2026-39832 against the real software inventory on every managed device, as each hourly inventory arrives. 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.