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CVE-2026-78660— HTTP/2 transport accepts malformed framing-related headers 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.

长期以来，我们在 HTTP/2 实现中对格式错误的、与帧相关的头部（framing-related headers）的处理较为宽松，因为这些头部不会影响 HTTP/2 帧的正常行为。然而，这种行为会导致当我们的实现作为反向代理使用时，可能将这些包含格式错误帧相关头部的响应转发给 HTTP/1 客户端。如果该 HTTP/1 客户端自身对头部的解析也不够严格，就可能引发响应走私（response smuggling）漏洞。

AI Predicted 7.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1132 · Data Encoding
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I. Basic Information for CVE-2026-78660

Vulnerability Information
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Vulnerability Title
HTTP/2 transport accepts malformed framing-related headers in net/http
Source: CVE Program / CVE List V5
Vulnerability Description
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
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-2026-78660

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III. Intelligence Information for CVE-2026-78660

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Patches & Fixes for CVE-2026-78660 (1)

Vendor Advisories for CVE-2026-78660 (1)

Vendor Pages for CVE-2026-78660 (1)

Other References for CVE-2026-78660 (2)

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-2026-78663 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
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-2026-78660

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