Allocation of Resources Without Limits or Throttling Affecting std/net/http package, versions <1.20.10>=1.21.0-0 <1.21.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 Jan 2026
- disclosed11 Oct 2023
- creditUnknown
Introduced: 11 Oct 2023
CVE-2023-39325 (opens in a new tab)How to fix?
Upgrade std/net/http to version 1.20.10, 1.21.3 or higher.
Overview
std/net/http is a Go standard library package std/net/http
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling.
Go Vulnerability Report:
A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing.With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection.This issue is also fixed in golang.org/x/net/http2 for users manually configuring HTTP/2.The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the golang.org/x/net/http2 package; see the Server.MaxConcurrentStreams setting and the ConfigureServer function.