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Date: Thu, 19 Oct 2023 09:41:13 +0000
From: Stefan Eissing <>
Subject: CVE-2023-45802: Apache HTTP Server: HTTP/2 stream memory not
 reclaimed right away on RST 

Severity: moderate

Affected versions:

- Apache HTTP Server 2.4.17 through 2.4.57


When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that.

This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out.

Users are recommended to upgrade to version 2.4.58, which fixes the issue.


Will Dormann of Vul Labs (finder)
David Warren of Vul Labs (finder)



2023-10-12: reported

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