What is CVE-2026-39828?

CVE-2026-39828 is a medium-severity vulnerability in Golang Crypto, classified under Improper Certificate Validation. CVSS score: 6.3/10. Published 2026-05-22.

How severe is CVE-2026-39828?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Golang Crypto

CVE-2026-39828

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeede…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

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

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

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

Frequently asked questions

What is CVE-2026-39828?: CVE-2026-39828 is a medium-severity vulnerability in Golang Crypto, classified under Improper Certificate Validation. CVSS score: 6.3/10. Published 2026-05-22.
How severe is CVE-2026-39828?: Medium severity. CVSS v3 base score is 6.3 out of 10.