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CVE-2026-97032— HTTP/2 server crash due to HPACK encoder race in net/http

Quick assessment

Affected
Go standard library net/http
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.

HTTP/2 服务器可能因并发修改其 HPACK 编码器而崩溃。问题的原因是服务器从两个 goroutine 中未经同步地修改 HPACK 编码器：其中一个 goroutine 在响应客户端时，使用编码器对 HEADERS 帧进行编码；另一个 goroutine 在处理客户端发送的包含 SETTINGS_HEADER_TABLE_SIZE 设置的 SETTINGS 帧时，修改编码器的表大小。恶意客户端可通过反复发送请求并不断更改头部表大小，导致服务器崩溃。

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-97032

Vulnerability Information
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Vulnerability Title
HTTP/2 server crash due to HPACK encoder race in net/http
Source: CVE Program / CVE List V5
Vulnerability Description
HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently. This happens because the server modifies the HPACK encoder from two goroutines without synchronization: one uses the encoder to encode a HEADERS frame as part of a response sent to a client and the other modifies the encoder's table size when handling a SETTINGS frame containing SETTINGS_HEADER_TABLE_SIZE that a client sends. A malicious client can repeatedly send a request while changing the header table size to crash the server.
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 net/http 0 ~ 1.26.9 -
Go standard library net/http/internal/http2 1.27.0-0 ~ 1.27.2 -
golang.org/x/net golang.org/x/net/http2 0 ~ 0.60.0 -

II. Public POCs for CVE-2026-97032

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III. Intelligence Information for CVE-2026-97032

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Patches & Fixes for CVE-2026-97032 (2)

Vendor Advisories for CVE-2026-97032 (2)

Vendor Pages for CVE-2026-97032 (1)

Other References for CVE-2026-97032 (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-2026-97030 Recognize yield as regexp preceder keyword in html/template
CVE-2026-97031 Reject malformed ECH outer extension references in crypto/tls

IV. Related Vulnerabilities

Same product: net/http
Same vendor: Go standard library

V. Comments for CVE-2026-97032

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