CVE-2026-78662
Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 2, 2026
- Updated
- Sep 3, 2026
- Reserved
- Aug 24, 2026
Description
Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
golang.org/x/crypto/sshgolang.org/x/crypto |
|
References
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