How severe is CVE-2026-39833?

CVE-2026-39833 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-2026-39833 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39833?

CVE-2026-39833 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39833?

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-2026-39833 have an EU (EUVD) identifier?

Yes. CVE-2026-39833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31389.

When was CVE-2026-39833 published?

CVE-2026-39833 was published on 2026-05-22 and last updated on 2026-06-17.

CVE-2026-39833

CVE-2026-39833 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31389
Weakness: CWE-862
Affected product: Golang Crypto
Published: 2026-05-22
Last modified: 2026-06-17

Description

The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

Frequently asked questions

What is CVE-2026-39833?: The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
How severe is CVE-2026-39833?: CVE-2026-39833 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-2026-39833 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39833?: CVE-2026-39833 affects Golang Crypto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39833?: 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-2026-39833 have an EU (EUVD) identifier?: Yes. CVE-2026-39833 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31389.
When was CVE-2026-39833 published?: CVE-2026-39833 was published on 2026-05-22 and last updated on 2026-06-17.

References

Affected products (1)

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

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