CVE-2026-78662Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh
Updated under an hour ago ()
Does this affect you?
It affects golang.org/x/crypto/ssh and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Go
- NVD analysis
- Analyzed
- Record last updated
- Sep 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
golang.org/x/crypto golang.org/x/crypto/ssh golang.org_x_crypto:ssh (from the name) | before 0.56.0 | CNA record |
golang crypto golang:crypto | before 0.56.0 | NVD |
References
- https://go.dev/issue/81316issue-tracking, vendor-advisory
- https://go.dev/cl/826504patch
- https://groups.google.com/g/golang-announce/c/1y3fb2np35Umailing-list, vendor-advisory
- https://pkg.go.dev/vuln/GO-2026-6354patch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.