CVE-2026-39827

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.20%• Percentile: 10%

Techniques & Countermeasures

• CWE-924•Improper Enforcement of Message Integrity During Transmission in a Communication Channel

  The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.

Affected Systems

• golang•crypto

  < 0.52.0

• golang.org/x•crypto

  < 0.52.0

• golang.org/x/crypto•ssh

  < 0.52.0

• golang.org/x/crypto•golang.org/x/crypto/ssh

  < 0.52.0

References (6)

• https://go.dev/issue/35127
• https://go.dev/cl/781320
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://pkg.go.dev/vuln/GO-2026-5016
• https://nvd.nist.gov/vuln/detail/CVE-2026-39827
• https://cs.opensource.google/go/x/crypto