Is CVE-2026-39828 in the CISA KEV catalog?

No. CVE-2026-39828 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-39828?

CVE-2026-39828 has a CVSS v3 base score of 6.3 (Moderate).

What is the EPSS score for CVE-2026-39828?

CVE-2026-39828 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39828?

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

CVE & CISA-KEV Catalog

CVE-2026-39828

MEDIUM

6.3

CVSS v3

NVD

Description

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 succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

CWE-295Improper Certificate Validation CWE-281

How to fix

Remediation Available

golang-go.cryptoDebian

Fixed in:1:0.52.0-1CVE-2026-39828

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% 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.