What is CVE-2026-39833?

CVE-2026-39833 is a critical-severity vulnerability in Golang Crypto, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-05-22.

How severe is CVE-2026-39833?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Golang Crypto

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…

Vulnerability class: Broken Access Control

EPSS: 0.000 (13.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Golang Crypto
Golang.org/x/crypto Golang.org/x/crypto/ssh/agent — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security@golang.org (Issue Tracking)
security@golang.org (Issue Tracking)
security@golang.org (Issue Tracking)
security@golang.org (Mailing List)
security@golang.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-39833?: CVE-2026-39833 is a critical-severity vulnerability in Golang Crypto, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-05-22.
How severe is CVE-2026-39833?: Critical severity. CVSS v3 base score is 9.1 out of 10.