Vulnerability in Golang Go
CVE-2025-61730
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.
EPSS: 0.003 (19.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Golang Go
- Go Standard Library Crypto/tls — versions 0, 1.25.0
References
- security@golang.org (Patch)
- security@golang.org (Patch)
- security@golang.org (Release Notes)
- security@golang.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-61730?
- CVE-2025-61730 is a medium-severity vulnerability in Golang Go, classified under CWE-940: IMPROPER VERIFICATION OF SOURCE OF A COMMUNICATION CHANNEL. CVSS score: 5.3/10. Published 2026-01-28.
- How severe is CVE-2025-61730?
- Medium severity. CVSS v3 base score is 5.3 out of 10.