CVE-2026-56862— Limit handshake messages we are willing to accept post-handshake in crypto/tls
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | crypto/tls | < 1.25.13 | affected |
1.26.0-0< 1.26.6 | affected | ||
1.27.0-0< 1.27.0-rc.3 | affected |
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I. Basic Information for CVE-2026-56862
Vulnerability Information
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Vulnerability Title
Limit handshake messages we are willing to accept post-handshake in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability Description
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国Google公司开源的一款支持并发编程的脚本语言。 Google Go 1.25.13之前版本、1.26.6之前版本和1.27.0-rc.3之前版本存在资源管理错误漏洞，该漏洞源于握手消息状态处理不当，恶意客户端可不断发送KeyUpdate消息，导致服务器无限执行密钥派生操作，造成拒绝服务。
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 ~ 1.25.13 | - |
II. Public POCs for CVE-2026-56862
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-56862 (1)
Vendor Advisories for CVE-2026-56862 (3)
Same Patch Batch · Go standard library · 2026-08-13 · 6 CVEs total
| CVE-2026-56859 | Add recursion depth guard during decode in encoding/xml | |
| CVE-2026-56858 | Fix Javascript regexp context tracking in html/template | |
| CVE-2026-56853 | Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http | |
| CVE-2026-56860 | Avoid quadratic complexity in resolvePath in net/url | |
| CVE-2026-33818 | Enforce maximum recursion depth in encoding/asn1 |
IV. Related Vulnerabilities
Same product: crypto/tls
- CVE-2026-42505
Invoking Encrypted Client Hello privacy leak in crypto/tls - CVE-2026-32283
Unauthenticated TLS 1.3 KeyUpdate record can cause persisten - CVE-2025-68121
Unexpected session resumption in crypto/tls - CVE-2025-61730
Handshake messages may be processed at the incorrect encrypt - 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-2026-56859
Add recursion depth guard during decode in encoding/xml - CVE-2026-33818
Enforce maximum recursion depth in encoding/asn1 - CVE-2026-56858
Fix Javascript regexp context tracking in html/template - CVE-2026-56853
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check
V. Comments for CVE-2026-56862
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