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.
Urgent
CVSS
9.8
Critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0059
48th percentile
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| apache2 · Debian 13.5 (trixie) | 2.4.69-1~deb13u1 | DEBIAN-CVE-2026-57941 | Oct 5, 2026 |
| apache2 · Debian 14 | 2.4.69-1 | DEBIAN-CVE-2026-57941 | Oct 5, 2026 |
| apache2 · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2 · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2 · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2 · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2 · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2 · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2 · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-bin · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2-bin 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2-bin · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2-bin 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2-bin · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2-bin 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2-bin · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2-bin 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2-bin · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2-bin 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2-data · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2-data 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2-data · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2-data 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2-data · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2-data 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2-data · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2-data 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2-data · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2-data 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2-devel · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2-devel · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-event · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-manual · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2-manual · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-prefork · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2-prefork · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-suexec-custom · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2-suexec-custom 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2-suexec-custom · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2-suexec-custom 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2-suexec-custom · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2-suexec-custom 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2-suexec-custom · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2-suexec-custom 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2-suexec-custom · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2-suexec-custom 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2-suexec-pristine · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2-suexec-pristine 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2-suexec-pristine · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2-suexec-pristine 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2-suexec-pristine · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2-suexec-pristine 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2-suexec-pristine · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2-suexec-pristine 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2-suexec-pristine · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2-suexec-pristine 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2-utils · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.27+esm12 | apache2-utils 2.4.29-1ubuntu4.27+esm12 | Oct 9, 2026 |
| apache2-utils · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | apache2-utils 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| apache2-utils · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | apache2-utils 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| apache2-utils · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | apache2-utils 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| apache2-utils · Ubuntu 26.04.1 LTS (resolute) | 2.4.66-2ubuntu2.5 | apache2-utils 2.4.66-2ubuntu2.5 | Oct 1, 2026 |
| apache2-utils · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2-utils · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| apache2-worker · sles 15.6 | 2.4.66-150600.5.58.1 | SUSE-SU-2026:5075-1 | Nov 7, 2026 |
| apache2-worker · sles 15.7 | 2.4.66-150700.4.26.1 | SUSE-SU-2026:5077-1 | Nov 7, 2026 |
| httpd · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-core · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-core-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-debugsource · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-devel · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-filesystem · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-manual · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-tools · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| httpd-tools-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| libapache2-mod-md · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.23+esm8 | libapache2-mod-md 2.4.41-4ubuntu3.23+esm8 | Oct 9, 2026 |
| libapache2-mod-md · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | libapache2-mod-md 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| libapache2-mod-md · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | libapache2-mod-md 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| 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 | Oct 9, 2026 |
| libapache2-mod-proxy-uwsgi · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.24 | libapache2-mod-proxy-uwsgi 2.4.52-1ubuntu4.24 | Oct 9, 2026 |
| libapache2-mod-proxy-uwsgi · Ubuntu 24.04.5 LTS (noble) | 2.4.58-1ubuntu8.16 | libapache2-mod-proxy-uwsgi 2.4.58-1ubuntu8.16 | Oct 9, 2026 |
| mod_http2 · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_http2-debuginfo · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_ldap · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_ldap-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_lua · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_lua-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_proxy_html · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_proxy_html-debuginfo · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_session · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_session-debuginfo · amzn 2023 | 2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_ssl · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
| mod_ssl-debuginfo · amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | ALAS2023-2026-3202 | Nov 7, 2026 |
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