Use-after-free in Apache HTTP Server - CVE-2026-48913

Vulnerability identifier: #VU133897

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48913

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in mod_http2 when file handles are already exhausted. A remote attacker can trigger request processing under file descriptor exhaustion conditions to execute arbitrary code.

Exploitation requires the server to have exhausted file handles.

Apache HTTP Server
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Ubuntu
Basesystem Module
SUSE Package Hub 15
Server Applications Module
openSUSE Leap
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
http2 (Red Hat package)
apache2 (Ubuntu package)
httpd-debuginfo
httpd-help
httpd-filesystem
mod_ssl
mod_session
mod_proxy_html
mod_md
mod_ldap
httpd-devel
httpd
httpd-debugsource
httpd-tools
apache2-tls13-utils
apache2-doc
apache2-tls13-prefork
apache2-tls13-worker
apache2-utils-debuginfo
apache2-tls13
apache2-utils
apache2-prefork
apache2-tls13-utils-debuginfo
apache2-debuginfo
apache2-tls13-prefork-debuginfo
apache2
apache2-prefork-debuginfo
apache2-tls13-doc
apache2-worker-debuginfo
apache2-tls13-debuginfo
apache2-example-pages
apache2-debugsource
apache2-tls13-worker-debuginfo
apache2-tls13-example-pages
apache2-tls13-debugsource
apache2-devel
apache2-worker
apache2-tls13-devel
apache2-event-debuginfo
apache2-event
apache2-manual
apache2-event-debugsource
apache2-utils-debugsource
apache2-worker-debugsource
apache2-prefork-debugsource

Install security update from vendor's website.

Apache HTTP Server - update to 2.4.68
http2 (Red Hat package) - addressed in versions 2.0.26-4.el9_6.2, 2.0.29-2.el10_0.2, 2.0.29-4.el10_2.2
apache2 (Ubuntu package) - addressed in versions 2.4.7-1ubuntu4.22+esm14, 2.4.18-2ubuntu3.17+esm19, 2.4.29-1ubuntu4.27+esm10, 2.4.41-4ubuntu3.23+esm5, 2.4.52-1ubuntu4.23, 2.4.58-1ubuntu8.15, 2.4.66-2ubuntu2.4
httpd-debuginfo - update to 2.4.58-20
httpd-help - update to 2.4.58-20
httpd-filesystem - update to 2.4.58-20
mod_ssl - update to 2.4.58-20
mod_session - update to 2.4.58-20
mod_proxy_html - update to 2.4.58-20
mod_md - update to 2.4.58-20
mod_ldap - update to 2.4.58-20
httpd-devel - update to 2.4.58-20
httpd - update to 2.4.58-20
httpd-debugsource - update to 2.4.58-20
httpd-tools - update to 2.4.58-20
apache2-tls13-utils - 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-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-tls13-prefork-debuginfo - 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-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-debuginfo - update to 2.4.66-35.81.1
apache2-example-pages - addressed in versions 2.4.66-35.81.1, 2.4.66-150400.6.57.1
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-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 - 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-manual - addressed in versions 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-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
• openEuler 24.03 LTS SP3 update for httpd
• openEuler 24.03 LTS SP1 update for httpd
• SUSE update for apache2
• SUSE update for apache2
• Red Hat Enterprise Linux 10 update for mod_http2
• SUSE update for apache2
• SUSE update for apache2
• Ubuntu update for apache2
• Ubuntu update for apache2
• Red Hat Enterprise Linux 10 update for mod_http2
• Red Hat Enterprise Linux 9 update for mod_http2