Description
During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.
Metrics
CVSS 3.1 5.3/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NAffected software
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | crypto/tls | < 1.24.12; >= 1.25.0, < 1.25.6 |
References
- https://go.dev/cl/724120Patch
- https://go.dev/issue/76443Patch
- https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUcRelease Notes
- https://pkg.go.dev/vuln/GO-2026-4340Vendor Advisory
Timeline
- Published
- Jan 28, 2026
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed