Vulnerability · Published Jan 28, 2026 · Assigned by Go
CVE-2025-61730Handshake messages may be processed at the incorrect encryption level in crypto/tls
Medium 5.3
In plain English
A medium-severity security flaw in crypto/tls from Go standard library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 74.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.22 | go | 1.24.12-r0 | ALPINE-CVE-2025-61730 |
| Alpine:v3.23 | go | 1.25.6-r0 | ALPINE-CVE-2025-61730 |
| Alpine:v3.24 | go | 1.25.6-r0 | ALPINE-CVE-2025-61730 |
| Debian:12 | golang-1.19 | no fix listed | DEBIAN-CVE-2025-61730 |
| Debian:13 | golang-1.24 | no fix listed | DEBIAN-CVE-2025-61730 |
| Go | stdlib | 1.24.12, 1.25.6 | GO-2026-4340 |
| Ubuntu:22.04:LTS | golang-1.17 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.18 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.20 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:24.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:24.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:24.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:25.10 | golang-1.23 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:26.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:24.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:25.10 | golang-1.24 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:26.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:22.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:24.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:25.10 | golang-1.25 | no fix listed | UBUNTU-CVE-2025-61730 |
| Ubuntu:26.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2025-61730 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | crypto/tls | 0 – before 1.24.121.25.0 – before 1.25.6 |