What is CVE-2026-39835?

CVE-2026-39835 is a medium-severity vulnerability in Golang Crypto, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-22.

How severe is CVE-2026-39835?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Golang Crypto

CVE-2026-39835

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these c…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (8.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-2026-39835?: CVE-2026-39835 is a medium-severity vulnerability in Golang Crypto, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-22.
How severe is CVE-2026-39835?: Medium severity. CVSS v3 base score is 5.3 out of 10.