Is CVE-2026-39835 in the CISA KEV catalog?

No. CVE-2026-39835 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-39835?

CVE-2026-39835 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-39835?

CVE-2026-39835 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39835?

Upgrade golang-go.crypto on debian unstable to 1:0.52.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-39835

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-295Improper Certificate Validation CWE-476NULL Pointer Dereference

How to fix

Remediation Available

golang-go.cryptoDebian

Fixed in:1:0.52.0-1CVE-2026-39835

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Vendor Advisory1

pkg.go.dev

Issue Tracking2

Mailing List1

groups.google.com

Other references5

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-01.