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7.5 High

CVE-2024-24791 The net/http HTTP/1.1 client mishandled the case where a server responds to a request with an "Expect: 100-continue"…

Description

The net/http HTTP/1.1 client mishandled the case where a server responds to a request with an "Expect: 100-continue" header with a non-informational (200 or higher) status. This mishandling could leave a client connection in an invalid state, where the next request sent on the connection will fail. An attacker sending a request to a net/http/httputil.ReverseProxy proxy can exploit this mishandling to cause a denial of service by sending "Expect: 100-continue" requests which elicit a non-informational response from the backend. Each such request leaves the proxy with an invalid connection, and causes one subsequent request using that connection to fail.

Affected products and versions

Product Affected versions Fixed in
net/http 1.22 1.22.0-0 → < 1.22.5 1.22.5
net/http 1.21 earliest → < 1.21.12 1.21.12
net\/http 1.22 1.22.0-0 → < 1.22.5 1.22.5
net\/http 1.21 earliest → < 1.21.12 1.21.12

Other CVEs of net/http

The 26 CVEs of net/http →
CVE-2026-97032 HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently 7.5 High CVE-2026-78663 The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream… 9.1 Critical CVE-2026-78669 A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams… 7.5 High CVE-2026-78667 When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS)… 7.5 High
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