CVE-2026-33857

EUVD-2026-26951
Out-of-bounds Read vulnerability in mod_proxy_ajp of 

Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 30%
Affected Products (NVD)
VendorProductVersion
apachehttp_server
𝑥
< 2.4.67
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
apache2
bookworm
2.4.67-1~deb12u2
fixed
bookworm (security)
2.4.67-1~deb12u3
fixed
bullseye
vulnerable
bullseye (security)
2.4.67-1~deb11u3
fixed
forky
2.4.68-1
fixed
sid
2.4.68-1
fixed
trixie
2.4.67-1~deb13u2
fixed
trixie (security)
2.4.67-1~deb13u3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
apache2
bionic
needs-triage
focal
needs-triage
jammy
Fixed 2.4.52-1ubuntu4.20
released
noble
Fixed 2.4.58-1ubuntu8.12
released
questing
Fixed 2.4.64-1ubuntu3.4
released
resolute
Fixed 2.4.66-2ubuntu2.1
released
trusty
needs-triage
xenial
needs-triage
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
apache2
suse enterprise desktop 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-devel
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-manual
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-prefork
suse enterprise desktop 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-utils
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-worker
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
httpd
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-core
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-devel
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-filesystem
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-manual
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-tools
RHEL 9
0:2.4.62-13.el9_8.1
fixed
mod
RHEL 9
1:2.4.62-13.el9_8.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
httpd
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-core
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-core-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-debuginfo
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-debugsource
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-devel
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-filesystem
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-manual
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-tools
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-tools-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ldap
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ldap-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_lua
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_lua-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_md
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
mod_proxy_html
Amazon Linux 2
1:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_proxy_html-debuginfo
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_session
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_session-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ssl
Amazon Linux 2
1:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_ssl-debuginfo
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
httpd
Azure Linux 3.0
0:2.4.67-1.azl3
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2026/05/04/15