GO-2026-6355

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Source

https://pkg.go.dev/vuln/GO-2026-6355

Import Source

https://vuln.go.dev/ID/GO-2026-6355.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-6355

Aliases

CVE-2026-56855

Published

2026-09-02T19:12:04Z

Modified

2026-09-02T19:30:10.076616950Z

Summary

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

Details

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection.

Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

Database specific

{
    "url": "https://pkg.go.dev/vuln/GO-2026-6355",
    "review_status": "REVIEWED"
}

References

Credits

- Will Mortensen

Affected packages

Go / golang.org/x/crypto

Package

Name: golang.org/x/crypto; View open source insights on deps.dev
Purl: pkg:golang/golang.org/x/crypto

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.56.0

Ecosystem specific

{
    "imports": [
        {
            "path": "golang.org/x/crypto/ssh",
            "symbols": [
                "Dial",
                "NewClientConn",
                "NewControlClientConn",
                "NewServerConn",
                "channel.handlePacket"
            ]
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-6355.json"