CVE-2025-61730 Handshake messages may be processed at the incorrect encryption level in crypto/tls

What is CVE-2025-61730?

CVE-2025-61730 is a medium-severity vulnerability in Golang Go, published on 28 Jan 2026.

Official 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.

Which versions are affected by CVE-2025-61730?

2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.

Products include Golang Go.

How do I fix CVE-2025-61730?

Upgrade golang to a fixed version for your release line: 1.24.12 or 1.25.6.

Is CVE-2025-61730 being exploited?

There is no known exploitation of CVE-2025-61730 in the wild and no public exploit code.

Other vulnerabilities in Golang Go

• CVE-2020-0601 Microsoft Windows CryptoAPI Spoofing Exploited High 8.1
• CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile Critical 9.8
• CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip Critical 9.8
• CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go Critical 9.8
• CVE-2023-24540 Improper handling of JavaScript whitespace in html/template Critical 9.8

All Golang Go vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-75648, AZL-75701, AZL-75731, AZL-78933, AZL-98580, BELL-CVE-2025-61730 and 431 more.