Heap-based buffer overflow in Apache APR-util - CVE-2026-34502

Vulnerability identifier: #VU144930

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-34502

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to heap-based buffer overflow in the apr memcached client when processing memcached responses. A remote attacker can send specially crafted responses to cause a denial of service.

Apache APR-util
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 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
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Ubuntu
Basesystem Module
Server Applications Module
openSUSE Leap
openEuler
apr-util (Ubuntu package)
libapr-util1-debugsource
libapr-util1-dbd-sqlite3
libapr-util1-dbd-sqlite3-debuginfo
libapr-util1-devel
libapr-util1
libapr-util1-debuginfo
apr-util-debuginfo
apr-util-odbc
apr-util
apr-util-debugsource
apr-util-devel
apr-util-pgsql
apr-util (Red Hat package)
libapr-util1-dbm-db-debuginfo
libapr-util1-dbd-mysql-debuginfo
libapr-util1-dbd-pgsql
libapr-util1-dbd-pgsql-debuginfo
libapr-util1-dbd-mysql
libapr-util1-dbm-db
apr-util (Debian package)

Install security update from vendor's website.

Apache APR-util - update to 1.6.4
apr-util (Ubuntu package) - addressed in versions 1.5.3-1ubuntu0.1~esm3, 1.5.4-1ubuntu0.1~esm1, 1.6.1-2ubuntu0.1+esm1, 1.6.1-4ubuntu2.2+esm1, 1.6.1-5ubuntu4.22.04.3, 1.6.3-1.1ubuntu7.1, 1.6.3-3ubuntu3.1
libapr-util1-debugsource - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1
libapr-util1-dbd-sqlite3 - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1, 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbd-sqlite3-debuginfo - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1, 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-devel - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1
libapr-util1 - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1, 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-debuginfo - addressed in versions 1.5.3-8.22.1, 1.5.3-8.34.1, 1.5.3-8.36.1, 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
apr-util-debuginfo - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util-odbc - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util-debugsource - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util-devel - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util-pgsql - addressed in versions 1.6.1-16, 1.6.4-1, 1.6.5-1
apr-util (Red Hat package) - addressed in versions 1.6.1-23.el9_8.1, 1.6.3-23.el10_2.1
apr-util-debuginfo - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbm-db-debuginfo - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbd-mysql-debuginfo - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbd-pgsql - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbd-pgsql-debuginfo - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
apr-util-devel - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbd-mysql - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
apr-util-debugsource - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
libapr-util1-dbm-db - addressed in versions 1.6.1-150300.18.8.1, 1.6.1-150600.27.3.1
apr-util (Debian package) - update to 1.6.3-3+deb13u1

• https://lists.apache.org/api/email.lua?id=z2xdh8chf516yrbngvl4wfhb40qn2k18
• https://apr.apache.org/

• Multiple vulnerabilities in Apache APR-util
• Debian update for apr-util
• openEuler 24.03 LTS SP3 update for apr-util
• openEuler 24.03 LTS SP1 update for apr-util
• openEuler 22.03 LTS SP4 update for apr-util
• openEuler 20.03 LTS SP4 update for apr-util
• openEuler 24.03 LTS SP4 update for apr-util
• SUSE update for libapr-util1
• SUSE update for apr-util
• SUSE update for apr-util
• Ubuntu update for apr-util
• Red Hat Enterprise Linux 9 update for apr-util
• Red Hat Enterprise Linux 10 update for apr-util