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Security Advisories

CVE-2026-78662

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-78662

Severity

7.5

High

CVSS V3

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Summary

Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-78662
  • https://pkg.go.dev/vuln/GO-2026-6354
  • https://go.dev/cl/826504
  • https://go.dev/issue/81316
  • https://groups.google.com/g/golang-announce/c/1y3fb2np35U
  • https://pkg.go.dev
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78662.json

Affected packages

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