CVE-2026-39830
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk47th percentile - higher than 47% of all known CVEs
Summary
In an SSH library (likely Go), a malicious SSH peer can send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine cannot be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.
Risk Assessment
An attacker could exhaust server resources by blocking connections and leaking goroutines, potentially leading to denial of service (DoS).
Recommendation
Update the SSH library to a version that discards unsolicited global responses.
Original NVD description (English source)
A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.