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CVE-2026-97031— Reject malformed ECH outer extension references 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.

根据 RFC 9849 的规定，不允许在 ECH（Encrypted Client Hello，加密客户端 hello）外层扩展中存在多个引用。此前，攻击者可以通过构造包含多个引用的恶意数据包，导致服务器进程出现内存耗尽问题。现在我们将其视为格式错误的报文并予以拒绝，从而有效遏制由此引发的内存放大攻击向量。

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-97031

Vulnerability Information
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Vulnerability Title
Reject malformed ECH outer extension references in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go standard library crypto/tls 0 ~ 1.26.9 -

II. Public POCs for CVE-2026-97031

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III. Intelligence Information for CVE-2026-97031

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Vendor Advisories for CVE-2026-97031 (1)

Vendor Pages for CVE-2026-97031 (1)

Other References for CVE-2026-97031 (1)

Other References for CVE-2026-97031 (1)

Same Patch Batch · Go standard library · 2026-10-08 · 13 CVEs total

CVE-2026-94439 HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
CVE-2026-94440 Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
CVE-2026-94448 Reset context tracking on consecutive template expressions in html/template
CVE-2026-56857 Root.Mkdir(All) can follow junctions out of the root on Windows in os
CVE-2026-56866 HTTP/1 client connection desynchronization after CONNECT rejection in net/http
CVE-2026-78659 HTTP/2 server memory exhaustion due to Trailer headers in net/http
CVE-2026-78660 HTTP/2 transport accepts malformed framing-related headers in net/http
CVE-2026-78663 Double flow control refund on HTTP/2 server streams in net/http
CVE-2026-78667 Lack of limit on size of parsed Range headers in net/http
CVE-2026-78669 Excessive CPU consumption from repeated initial window changes in net/http
CVE-2026-97032 HTTP/2 server crash due to HPACK encoder race in net/http
CVE-2026-97030 Recognize yield as regexp preceder keyword in html/template

IV. Related Vulnerabilities

Same product: crypto/tls
Same vendor: Go standard library

V. Comments for CVE-2026-97031

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