How severe is CVE-2026-39832?

CVE-2026-39832 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-39832 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39832?

CVE-2026-39832 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39832?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39832 have an EU (EUVD) identifier?

Yes. CVE-2026-39832 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31390.

When was CVE-2026-39832 published?

CVE-2026-39832 was published on 2026-05-22 and last updated on 2026-07-08.

CVE-2026-39832

CVE-2026-39832 is a critical-severity vulnerability in Golang Crypto with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31390
Weakness: CWE-502
Affected product: Golang Crypto
Published: 2026-05-22
Last modified: 2026-07-08

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.

Frequently asked questions

What is CVE-2026-39832?: 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.
How severe is CVE-2026-39832?: CVE-2026-39832 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-39832 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39832?: CVE-2026-39832 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39832?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39832 have an EU (EUVD) identifier?: Yes. CVE-2026-39832 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31390.
When was CVE-2026-39832 published?: CVE-2026-39832 was published on 2026-05-22 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

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