# CVE-2026-57941: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy CVE-2026-57941 is fixed in 35 products on 1 platform, first by apache2 2.4.66-2ubuntu2.5, released October 1, 2026. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2026-57941 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.0059 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 1, 2026 - Weakness: Use After Free - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57941 ## Description Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apache2 Debian 13.5 (trixie) | 2.4.69-1~deb13u1 | [DEBIAN-CVE-2026-57941](https://patchblox.com/security/data/fix/linux/debian-cve-2026-57941.md) | Oct 5, 2026 | | Linux | apache2 Debian 14 | 2.4.69-1 | [DEBIAN-CVE-2026-57941](https://patchblox.com/security/data/fix/linux/debian-cve-2026-57941.md) | Oct 5, 2026 | | Linux | apache2 Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2 Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2 Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2 Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2 Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2 sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2 sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-bin Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2-bin 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-bin-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2-bin Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2-bin 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-bin-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2-bin Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2-bin 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-bin-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2-bin Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2-bin 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-bin-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2-bin Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2-bin 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-bin-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2-data Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2-data 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-data-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2-data Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2-data 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-data-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2-data Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2-data 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-data-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2-data Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2-data 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-data-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2-data Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2-data 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-data-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2-devel sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2-devel sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-event sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-manual sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2-manual sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-prefork sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2-prefork sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-suexec-custom Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2-suexec-custom 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-suexec-custom-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2-suexec-custom Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2-suexec-custom 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-suexec-custom-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2-suexec-custom Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2-suexec-custom 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-suexec-custom-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2-suexec-custom Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2-suexec-custom 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-suexec-custom-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2-suexec-custom Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2-suexec-custom 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-suexec-custom-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2-suexec-pristine Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2-suexec-pristine 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-suexec-pristine-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2-suexec-pristine Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2-suexec-pristine 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-suexec-pristine-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2-suexec-pristine Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2-suexec-pristine 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-suexec-pristine-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2-suexec-pristine Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2-suexec-pristine 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-suexec-pristine-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2-suexec-pristine Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2-suexec-pristine 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-suexec-pristine-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2-utils Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | [apache2-utils 2.4.29-1ubuntu4.27+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-apache2-utils-2.4.29-1ubuntu4.27-esm12.md) | Oct 9, 2026 | | Linux | apache2-utils Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [apache2-utils 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-apache2-utils-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | apache2-utils Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [apache2-utils 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-apache2-utils-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | apache2-utils Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [apache2-utils 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-apache2-utils-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | apache2-utils Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | [apache2-utils 2.4.66-2ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-apache2-utils-2.4.66-2ubuntu2.5.md) | Oct 1, 2026 | | Linux | apache2-utils sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2-utils sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | apache2-worker sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 | | Linux | apache2-worker sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 | | Linux | httpd amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-core amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-core-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-debugsource amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-devel amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-filesystem amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-manual amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-tools amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | httpd-tools-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | libapache2-mod-md Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [libapache2-mod-md 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libapache2-mod-md-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | libapache2-mod-md Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [libapache2-mod-md 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libapache2-mod-md-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | libapache2-mod-md Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [libapache2-mod-md 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapache2-mod-md-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | libapache2-mod-proxy-uwsgi Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | [libapache2-mod-proxy-uwsgi 2.4.41-4ubuntu3.23+esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libapache2-mod-proxy-uwsgi-2.4.41-4ubuntu3.23-esm8.md) | Oct 9, 2026 | | Linux | libapache2-mod-proxy-uwsgi Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | [libapache2-mod-proxy-uwsgi 2.4.52-1ubuntu4.24](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libapache2-mod-proxy-uwsgi-2.4.52-1ubuntu4.24.md) | Oct 9, 2026 | | Linux | libapache2-mod-proxy-uwsgi Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | [libapache2-mod-proxy-uwsgi 2.4.58-1ubuntu8.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapache2-mod-proxy-uwsgi-2.4.58-1ubuntu8.16.md) | Oct 9, 2026 | | Linux | mod_http2 amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_http2-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_ldap amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_ldap-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_lua amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_lua-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_proxy_html amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_proxy_html-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_session amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_session-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_ssl amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | | Linux | mod_ssl-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.