CVE-2026-39827: CWE-401: Missing Release of Memory after Effective Lifetime in golang.org/x/crypto golang.org/x/crypto/ssh
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.
AI Analysis
Technical Summary
This vulnerability in golang.org/x/crypto/ssh involves improper memory management where rejected SSH channels remain in the server's internal state, leading to unbounded memory growth when an authenticated client repeatedly opens such channels. This can cause the server process to crash, impacting all connected users. The flaw is identified as CWE-401 (missing release of memory after effective lifetime). No patch or remediation guidance is currently provided, and no CVSS score is assigned.
Potential Impact
Exploitation of this vulnerability can cause the SSH server process to crash due to unbounded memory growth, resulting in denial of service for all users connected to the server. The impact is limited to availability disruption of the SSH service. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor for unusual SSH channel activity and consider limiting or restricting clients that repeatedly open rejected channels to reduce risk of memory exhaustion.
CVE-2026-39827: CWE-401: Missing Release of Memory after Effective Lifetime in golang.org/x/crypto golang.org/x/crypto/ssh
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in golang.org/x/crypto/ssh involves improper memory management where rejected SSH channels remain in the server's internal state, leading to unbounded memory growth when an authenticated client repeatedly opens such channels. This can cause the server process to crash, impacting all connected users. The flaw is identified as CWE-401 (missing release of memory after effective lifetime). No patch or remediation guidance is currently provided, and no CVSS score is assigned.
Potential Impact
Exploitation of this vulnerability can cause the SSH server process to crash due to unbounded memory growth, resulting in denial of service for all users connected to the server. The impact is limited to availability disruption of the SSH service. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should monitor for unusual SSH channel activity and consider limiting or restricting clients that repeatedly open rejected channels to reduce risk of memory exhaustion.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Go
- Date Reserved
- 2026-04-07T18:13:03.528Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0fcdabe1370fbb487d4ff6
Added to database: 5/22/2026, 3:29:47 AM
Last enriched: 5/22/2026, 3:45:47 AM
Last updated: 5/23/2026, 10:01:54 PM
Views: 17
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