Use-after-free in Apache HTTP Server - CVE-2026-29167

Vulnerability identifier: #VU133908

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-29167

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in mod_ldap per-directory configuration when processing per-directory configuration. A local user can trigger processing of affected per-directory configuration to cause a denial of service.

Apache HTTP Server
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Ubuntu
SUSE Package Hub 15
Server Applications Module
Basesystem Module
openSUSE Leap
openEuler
WebSphere Remote Server
IBM Rational ClearQuest
apache2 (Ubuntu package)
httpd-devel
httpd
httpd-debuginfo
httpd-debugsource
httpd-tools
mod_ldap
mod_md
mod_session
mod_ssl
httpd-filesystem
mod_proxy_html
httpd-help
apache2-example-pages
apache2-tls13-prefork-debuginfo
apache2-tls13-debuginfo
apache2-worker-debuginfo
apache2-tls13-utils
apache2-tls13-prefork
apache2-tls13-worker
apache2-utils-debuginfo
apache2-tls13
apache2-utils
apache2-prefork
apache2-tls13-utils-debuginfo
apache2-debuginfo
apache2-debugsource
apache2-tls13-worker-debuginfo
apache2-tls13-example-pages
apache2-tls13-debugsource
apache2-devel
apache2-worker
apache2-tls13-devel
apache2
apache2-prefork-debuginfo
apache2-tls13-doc
apache2-doc
apache2-event
apache2-event-debuginfo
apache2-event-debugsource
apache2-utils-debugsource
apache2-manual
apache2-worker-debugsource
apache2-prefork-debugsource

Install security update from vendor's website.

Apache HTTP Server - update to 2.4.68
apache2 (Ubuntu package) - addressed in versions 2.4.7-1ubuntu4.22+esm15, 2.4.18-2ubuntu3.17+esm20, 2.4.29-1ubuntu4.27+esm11, 2.4.41-4ubuntu3.23+esm6, 2.4.52-1ubuntu4.23, 2.4.58-1ubuntu8.15, 2.4.66-2ubuntu2.4
httpd-devel - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd-debuginfo - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd-debugsource - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd-tools - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
mod_ldap - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
mod_md - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
mod_session - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
mod_ssl - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd-filesystem - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
mod_proxy_html - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
httpd-help - addressed in versions 2.4.43-37, 2.4.51-33, 2.4.58-20
apache2-example-pages - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1
apache2-tls13-prefork-debuginfo - update to 2.4.66-35.81.1
apache2-tls13-debuginfo - update to 2.4.66-35.81.1
apache2-worker-debuginfo - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13-utils - update to 2.4.66-35.81.1
apache2-tls13-prefork - update to 2.4.66-35.81.1
apache2-tls13-worker - update to 2.4.66-35.81.1
apache2-utils-debuginfo - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13 - update to 2.4.66-35.81.1
apache2-utils - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-prefork - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13-utils-debuginfo - update to 2.4.66-35.81.1
apache2-debuginfo - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-debugsource - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13-worker-debuginfo - update to 2.4.66-35.81.1
apache2-tls13-example-pages - update to 2.4.66-35.81.1
apache2-tls13-debugsource - update to 2.4.66-35.81.1
apache2-devel - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-worker - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13-devel - update to 2.4.66-35.81.1
apache2 - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-prefork-debuginfo - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-tls13-doc - update to 2.4.66-35.81.1
apache2-doc - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1
apache2-event - addressed in versions 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-event-debuginfo - addressed in versions 2.4.66-150400.6.57.1, 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-event-debugsource - addressed in versions 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-utils-debugsource - addressed in versions 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-manual - addressed in versions 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-worker-debugsource - addressed in versions 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1
apache2-prefork-debugsource - addressed in versions 2.4.66-150600.5.55.1, 2.4.66-150700.4.23.1

• https://downloads.apache.org/httpd/CHANGES_2.4_2.4.68

• Multiple vulnerabilities in Apache HTTP Server
• Multiple vulnerabilities in IBM WebSphere Remote Server
• openEuler 24.03 LTS SP3 update for httpd
• openEuler 24.03 LTS SP1 update for httpd
• openEuler 22.03 LTS SP4 update for httpd
• openEuler 20.03 LTS SP4 update for httpd
• SUSE update for apache2
• SUSE update for apache2
• SUSE update for apache2
• SUSE update for apache2
• Ubuntu update for apache2
• Ubuntu update for apache2
• Multiple vulnerabilities in IBM Rational ClearQuest