Is CVE-2026-39827 in the CISA KEV catalog?

No. CVE-2026-39827 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-39827?

CVE-2026-39827 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-39827?

CVE-2026-39827 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39827?

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

CVE & CISA-KEV Catalog

CVE-2026-39827

MEDIUM

6.5

CVSS v3

NVD

Description

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

CWE-924

How to fix

Remediation Available

golang-go.cryptoDebian

Fixed in:1:0.52.0-1CVE-2026-39827

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

pkg.go.dev

Issue Tracking2

Mailing List1

groups.google.com

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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 2026-05-26.