CVE-2025-61730— Handshake messages may be processed at the incorrect encryption level in crypto/tls
Quick assessment
Affected
Go standard library crypto/tls
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于TLS 1.3握手期间处理跨加密级别边界消息的顺序问题，可能导致轻微信息泄露。
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I. Basic Information for CVE-2025-61730
Vulnerability Information
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Vulnerability Title
Handshake messages may be processed at the incorrect encryption level in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于TLS 1.3握手期间处理跨加密级别边界消息的顺序问题，可能导致轻微信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Go standard library | crypto/tls | 0 ~ 1.24.12 | - |
|
II. Public POCs for CVE-2025-61730
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Go standard library · 2026-01-28 · 3 CVEs total
| CVE-2025-61728 | Excessive CPU consumption when building archive index in archive/zip | |
| CVE-2025-61726 | Memory exhaustion in query parameter parsing in net/url |
IV. Related Vulnerabilities
Same product: crypto/tls
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CVE-2025-68121
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CVE-2025-58189
ALPN negotiation error contains attacker controlled informat
Same vendor: Go standard library
-
CVE-2026-56860
Avoid quadratic complexity in resolvePath in net/url -
CVE-2026-56853
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check -
CVE-2026-56859
Add recursion depth guard during decode in encoding/xml -
CVE-2026-33818
Enforce maximum recursion depth in encoding/asn1 -
CVE-2026-56862
Limit handshake messages we are willing to accept post-hands
V. Comments for CVE-2025-61730
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