Medium 6.5Published May 21, 2026

CVE-2026-39827Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh

Updated under an hour ago (Oct 27, 2026, 7:10 PM ET)

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It affects golang.org/x/crypto/ssh and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for golang.org/x/crypto/ssh

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-401
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Analyzed
Record last updated: May 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

golang.org/x/crypto golang.org/x/crypto/ssh golang.org_x_crypto:ssh (from the name)	before 0.52.0	CNA record
golang crypto golang:crypto	before 0.52.0	NVD

References

References

https://go.dev/issue/35127	issue-tracking
https://go.dev/cl/781320	issue-tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvI	mailing-list
https://pkg.go.dev/vuln/GO-2026-5016	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.