CVE-2026-39835

Name: CVE-2026-39835
Creator: NVD / NIST
Published: 2026-05-22T04:16:24.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-39835 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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 callbacks are nil.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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 callbacks are nil.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.21%

11.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Golang	Crypto	< 0.52.0

References

https://go.dev/cl/781660Issue Tracking
https://go.dev/issue/79563Issue Tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvIMailing List
https://pkg.go.dev/vuln/GO-2026-5015Vendor Advisory

Timeline

Published: May 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-39835?

How severe is CVE-2026-39835?

CVE-2026-39835 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-39835?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-39835?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST