GO-2026-4870

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Source

https://pkg.go.dev/vuln/GO-2026-4870

Import Source

https://vuln.go.dev/ID/GO-2026-4870.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-4870

Aliases

CVE-2026-32283

Published

2026-04-07T22:53:49Z

Modified

2026-04-08T01:15:28.922954Z

Summary

Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls

Details

If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service.

This only affects TLS 1.3.

Database specific

{
    "review_status": "REVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-4870"
}

References

Credits

- Jakub Ciolek - https://ciolek.dev/

Affected packages

Go / stdlib

Package

Name: stdlib; View open source insights on deps.dev
Purl: pkg:golang/stdlib

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.25.9

Introduced

1.26.0-0

Fixed

1.26.2

Ecosystem specific

{
    "imports": [
        {
            "path": "crypto/tls",
            "symbols": [
                "Conn.Handshake",
                "Conn.HandshakeContext",
                "Conn.Read",
                "Conn.Write",
                "Conn.handleKeyUpdate",
                "Dial",
                "DialWithDialer",
                "Dialer.Dial",
                "Dialer.DialContext",
                "QUICConn.HandleData",
                "QUICConn.Start",
                "clientHandshakeStateTLS13.establishHandshakeKeys",
                "clientHandshakeStateTLS13.readServerFinished",
                "serverHandshakeStateTLS13.readClientFinished",
                "serverHandshakeStateTLS13.sendServerParameters"
            ]
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-4870.json"