UnratedFix available
Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls
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.
Announced Group revision 1
Original source ↗GO-2026-4870
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:GO-2026-4870
stdlib
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.25.9
Source reference:
/affected/0/ranges1.26.2Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.25.9"
},
{
"introduced": "1.26.0-0"
},
{
"fixed": "1.26.2"
}
]
}
],
"package": {
"name": "stdlib",
"purl": "pkg:golang/stdlib",
"ecosystem": "Go"
},
"database_specific": {
"source": "https://vuln.go.dev/ID/GO-2026-4870.json"
},
"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"
]
}
]
}
}
]- Related CVEs
- CVE-2026-32283
Source reference:
/aliases
Publisher severity
No explicit severity was provided.
- Event
- #75182 · Revision 1
- Added to Heist Feed
- Publisher date