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CVE-2023-45802 — Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST

2026-10-10T16:57:06.159128+00:00

Affected: Apache Software Foundation Apache HTTP Server

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.

USN-6506-1 — apache2 vulnerabilities

2026-10-10T16:57:06.159210+00:00

Affected: Ubuntu:20.04:LTS: apache2, Ubuntu:22.04:LTS: apache2

David Shoon discovered that the Apache HTTP Server mod_macro module incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2023-31122)

Prof. Sven Dietrich, Isa Jafarov, Prof. Heejo Lee, and Choongin Lee discovered that the Apache HTTP Server incorrectly handled certain HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. This issue only affected Ubuntu 23.04, and Ubuntu 23.10. (CVE-2023-43622)

Will Dormann and David Warren discovered that the Apache HTTP Server incorrectly handled memory when handling HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. (CVE-2023-45802)