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.
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade httpd-manualUpgrade httpd-filesystemUpgrade mod_mdUpgrade mod_http2Upgrade mod_ldapUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-develUpgrade mod_proxy_htmlUpgrade httpdUpgrade httpd-tools | May 8, 2024 | Oct 23, 2023 |
| Alpine Linux | — | Upgrade apache2 | Mar 26, 2024 | Oct 23, 2023 |
| Amazon Linux Ami 2 | — | Upgrade httpd-toolsUpgrade mod_mdUpgrade mod_proxy_htmlUpgrade httpd-manualUpgrade mod_sslUpgrade httpd-debuginfoUpgrade httpd-develUpgrade httpdUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-filesystem | Nov 3, 2023 | Oct 23, 2023 |
| Amazon_linux | — | Upgrade httpd24 | Nov 4, 2023 | Oct 23, 2023 |
| Amazon_linux_2023 | — | Upgrade httpd-coreUpgrade mod_ldap-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_proxy_htmlUpgrade httpd-manualUpgrade httpd-toolsUpgrade httpd-core-debuginfoUpgrade mod_lua-debuginfoUpgrade mod_session-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade httpd-tools-debuginfoUpgrade httpd-filesystemUpgrade mod_sessionUpgrade mod_sslUpgrade httpdUpgrade httpd-debuginfoUpgrade mod_luaUpgrade httpd-debugsourceUpgrade mod_ldapUpgrade httpd-devel | Feb 17, 2025 | Oct 19, 2023 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Nov 29, 2023 | Oct 23, 2023 |
| Debian | — | Upgrade apache2 | Apr 18, 2024 | Oct 23, 2023 |
| Freebsd | — | Upgrade apache24 | Dec 10, 2025 | Oct 19, 2023 |
| Huawei Euleros 2_0_sp10 | — | Upgrade httpd-filesystemUpgrade httpd-toolsUpgrade mod_sslUpgrade httpd | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade mod_sslUpgrade httpdUpgrade httpd-filesystemUpgrade httpd-tools | Jan 10, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade httpd-toolsUpgrade httpd-develUpgrade mod_sslUpgrade httpd-filesystemUpgrade httpd-manualUpgrade mod_sessionUpgrade httpd | Mar 13, 2024 | Oct 23, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade mod_sslUpgrade httpd-filesystemUpgrade httpdUpgrade httpd-tools | Jan 10, 2024 | Oct 23, 2023 |
| Oracle_linux | — | Upgrade httpd-develUpgrade httpd-manualUpgrade httpdUpgrade httpd-toolsUpgrade mod_mdUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_sslUpgrade mod_http2 | May 8, 2024 | Oct 19, 2023 |
| Redhat_linux | — | Upgrade mod_sessionUpgrade httpd-tools-debuginfoUpgrade httpd-develUpgrade mod_mdUpgrade httpd-filesystemUpgrade mod_http2-debuginfoUpgrade httpd-debuginfoNo solution existsUpgrade mod_sslUpgrade mod_md-debuginfoUpgrade mod_md-debugsourceUpgrade httpdUpgrade httpd-manualUpgrade httpd-debugsourceUpgrade mod_http2Upgrade mod_ldapUpgrade mod_proxy_html-debuginfoUpgrade mod_proxy_htmlUpgrade mod_ssl-debuginfoUpgrade mod_http2-debugsourceUpgrade httpd-toolsUpgrade mod_ldap-debuginfoUpgrade mod_session-debuginfo | May 1, 2024 | Oct 23, 2023 |
| Rocky_linux | — | Upgrade httpdUpgrade mod_ldap-debuginfoUpgrade mod_session-debuginfoUpgrade mod_sessionUpgrade mod_mdUpgrade mod_sslUpgrade mod_http2-debuginfoUpgrade httpd-debuginfoUpgrade httpd-develUpgrade httpd-debugsourceUpgrade httpd-tools-debuginfoUpgrade mod_ldapUpgrade mod_md-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_http2-debugsourceUpgrade httpd-toolsUpgrade mod_proxy_htmlUpgrade mod_http2Upgrade mod_md-debugsource | Jun 17, 2024 | Oct 23, 2023 |
| Ubuntu | — | Upgrade apache2Upgrade apache2 (Ubuntu Pro) | Nov 23, 2023 | Oct 23, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Oct 23, 2023 |
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