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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78662
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-02 20:17:37 UTC
Updated2026-09-02 20:17:37 UTC
DescriptionPreviously, 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.

Risk And Classification

Problem Types: CWE-770: Allocation of Resources Without Limits or Throttling

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Golang.orgxcrypto Golang.org/x/crypto/ssh affected 0.56.0 semver Not specified

References

ReferenceSourceLinkTags
go.dev/cl/826504 [email protected] go.dev
go.dev/issue/81316 [email protected] go.dev
groups.google.com/g/golang-announce/c/1y3fb2np35U [email protected] groups.google.com
pkg.go.dev/vuln/GO-2026-6354 [email protected] pkg.go.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Will Mortensen (en)

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