CVE-2026-39827 Details
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.
A memory leak vulnerability has been identified in the Go programming language's SSH client, specifically in the 'golang.org/x/crypto/ssh' package, prior to version 0.52.0. This vulnerability arises when an authenticated SSH client repeatedly opens channels that are rejected by the server. The rejected channels are not properly managed, leading to unbounded memory growth. This memory leak can eventually crash the server process, impacting all connected users. The issue has been addressed by ensuring that rejected channels are removed from the connection's internal state and released for garbage collection.
Users can update to Go version 0.52.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://go.dev/cl/781320 | [email protected] | Issue Tracking |
| https://go.dev/issue/35127 | [email protected] | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/a082jnz-LvI | [email protected] | Mailing List |
| https://pkg.go.dev/vuln/GO-2026-5016 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-924 | Improper Enforcement of Message Integrity During Transmission in a Communication Channel | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| golang crypto | < 0.52.0 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | Initial Analysis | [email protected] |
| May 22, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | New CVE Received | [email protected] |