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Fencer Vulns
high 7.5

CVE-2026-29169 json

Apache HTTP Server: mod_dav_lock indirect lock crash

published 2026-05-04 6 mo ago modified 2026-10-25 14 d ago also BIT-apache-2026-29169 , EUVD-2026-26957

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.

The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.

Patch / fix

  • bitnami apache 2.4.67
  • apache http_server 2.4.67
  • apache2 Debian 12 2.4.67-1~deb12u2
  • apache2 Debian 13 2.4.67-1~deb13u2
  • apache2 Debian 14 2.4.67-1

debian advisories DEBIAN-CVE-2026-29169

  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.20
  • apache2 Ubuntu 24.04 LTS 2.4.58-1ubuntu8.12
  • apache2 Ubuntu 25.10 2.4.64-1ubuntu3.4
  • apache2 Ubuntu 26.04 LTS 2.4.66-2ubuntu2.1
  • apache2 Ubuntu Pro 14.04 LTS 2.4.7-1ubuntu4.22+esm13
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm18
  • apache2 Ubuntu Pro 18.04 LTS 2.4.29-1ubuntu4.27+esm9
  • apache2 Ubuntu Pro 20.04 LTS 2.4.41-4ubuntu3.23+esm4

ubuntu advisories UBUNTU-CVE-2026-29169

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd RHEL 8 2.4.37-65.module+el8.10.0+24521+219dcfc5.9
  • mod_md RHEL 8 1:2.0.8-8.module+el8.10.0+23815+1b5e1c66.2
  • mod_ssl RHEL 8 1:2.4.37-65.module+el8.10.0+24521+219dcfc5.9
  • mod_ldap RHEL 8 2.4.37-65.module+el8.10.0+24521+219dcfc5.9
  • mod_http2 RHEL 8 1.15.7-10.module+el8.10.0+24521+219dcfc5.7
  • httpd-tools RHEL 8 2.4.37-65.module+el8.10.0+24521+219dcfc5.9
  • mod_session RHEL 8 2.4.37-65.module+el8.10.0+24521+219dcfc5.9
  • httpd-manual RHEL 8 2.4.37-65.module+el8.10.0+24521+219dcfc5.9

red hat advisories RHSA-2026:67152RHSA-2026:66323RHSA-2026:62165RHSA-2026:47046RHSA-2026:42828RHSA-2026:41906

  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
  • apache2 SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2-event SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2-utils SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2-manual SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2-worker SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2-prefork SLES 16.0, SLES for SAP applications 16.0 2.4.66-160000.2.1
  • apache2 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.4.66-35.78.1

suse advisories SUSE-SU-2026:2641-1SUSE-SU-2026:2686-1SUSE-SU-2026:22199-1SUSE-SU-2026:22209-1

  • apache2 openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2-event openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2-utils openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2-manual openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2-worker openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2-prefork openSUSE Leap 16.0 2.4.66-160000.2.1
  • apache2 openSUSE Tumbleweed 2.4.67-1.1

opensuse advisories openSUSE-SU-2026:21115-1openSUSE-SU-2026:10785-1

  • httpd AlmaLinux 8 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
  • mod_ssl AlmaLinux 8 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_ldap AlmaLinux 8 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_http2 AlmaLinux 8 1.15.7-10.module_el8.10.0+4233+8b7d9181.7
  • httpd-tools AlmaLinux 8 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • mod_session AlmaLinux 8 2.4.37-65.module_el8.10.0+4233+8b7d9181.9
  • httpd-manual AlmaLinux 8 2.4.37-65.module_el8.10.0+4233+8b7d9181.9

almalinux advisories ALSA-2026:42828ALSA-2026:41906ALSA-2026:34109

  • httpd Rocky Linux 9 2.4.62-13.el9_8.5
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1984+1bed3124.4
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1938+3b7755d4.3
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+40045+6ce8579b.6
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+40206+be2c8a50.8
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+40053+5a18018e.7
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1830+22f0c9e0
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1842+4a9649e8.2

rocky linux advisories RLSA-2026:41906RLSA-2026:42828RLSA-2026:34109

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.4.67-r0

alpine advisories ALPINE-CVE-2026-29169

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd Azure Linux 3.0 2.4.67-1

azure linux advisories AZL-86019

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-29169 updated cvss 7.5

httpd: NULL pointer dereference via specially crafted request

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual
    affected: workaround, no fix available “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.”
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.10.0+23815+1b5e1c66.2, httpd 2.4.37-65.module+el8.10.0+24521+219dcfc5.9, mod_ssl 2.4.37-65.module+el8.10.0+24521+219dcfc5.9, mod_ldap 2.4.37-65.module+el8.10.0+24521+219dcfc5.9, mod_http2 1.15.7-10.module+el8.10.0+24521+219dcfc5.7, httpd-tools 2.4.37-65.module+el8.10.0+24521+219dcfc5.9, +4 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:42828
  • Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.62-13.el9_8.5, mod_lua 2.4.62-13.el9_8.5, mod_ssl 2.4.62-13.el9_8.5, mod_ldap 2.4.62-13.el9_8.5, httpd-core 2.4.62-13.el9_8.5, httpd-tools 2.4.62-13.el9_8.5, +4 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:41906
  • Red Hat Enterprise Linux AppStream (v. 10) httpd 2.4.63-13.el10_2.4, mod_lua 2.4.63-13.el10_2.4, mod_ssl 2.4.63-13.el10_2.4, mod_ldap 2.4.63-13.el10_2.4, httpd-core 2.4.63-13.el10_2.4, httpd-tools 2.4.63-13.el10_2.4, +4 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:34109
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) httpd 2.4.53-11.el9_2.15, httpd-core 2.4.53-11.el9_2.15
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:67152
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) httpd 2.4.57-11.el9_4.5, httpd-core 2.4.57-11.el9_4.5
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:66323
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) httpd 2.4.63-1.el10_0.4, mod_lua 2.4.63-1.el10_0.4, mod_ssl 2.4.63-1.el10_0.4, mod_ldap 2.4.63-1.el10_0.4, httpd-core 2.4.63-1.el10_0.4, httpd-tools 2.4.63-1.el10_0.4, +4 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:47046
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) httpd 2.4.62-4.el9_6.6, mod_lua 2.4.62-4.el9_6.6, mod_ssl 2.4.62-4.el9_6.6, mod_ldap 2.4.62-4.el9_6.6, httpd-core 2.4.62-4.el9_6.6, httpd-tools 2.4.62-4.el9_6.6, +4 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:62165
show 6 more
  • Red Hat Enterprise Linux Server (v. 7 ELS) httpd 2.4.6-99.el7_9.8 Red Hat Enterprise Linux Server Optional (v. 7 ELS) httpd-debuginfo 2.4.6-99.el7_9.8
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:92590
  • Red Hat Hardened Images httpd 2.4.67-1.hum1, httpd-core 2.4.67-1.hum1, httpd-tools 2.4.67-1.hum1, httpd-manual 2.4.67-1.hum1, httpd-filesystem 2.4.67-1.hum1
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:17080
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1786433656
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:53371
  • Red Hat JBoss Core Services 2.4.62.SP4
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:27201
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.62-13.el7jbcs, jbcs-httpd24-mod_ssl 2.4.62-13.el7jbcs, jbcs-httpd24-mod_ldap 2.4.62-13.el7jbcs, jbcs-httpd24-httpd-tools 2.4.62-13.el7jbcs, jbcs-httpd24-mod_session 2.4.62-13.el7jbcs, jbcs-httpd24-httpd-manual 2.4.62-13.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.62-13.el8jbcs, jbcs-httpd24-mod_ssl 2.4.62-13.el8jbcs, jbcs-httpd24-mod_ldap 2.4.62-13.el8jbcs, jbcs-httpd24-httpd-tools 2.4.62-13.el8jbcs, jbcs-httpd24-mod_session 2.4.62-13.el8jbcs, jbcs-httpd24-httpd-manual 2.4.62-13.el8jbcs, +2 more
    fixed: vendor fix “Disabling mod_dav_lock and restarting httpd will mitigate this flaw.” RHSA-2026:27200
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) httpd 2.4.53-11.el9_2.15, mod_lua 2.4.53-11.el9_2.15, mod_ssl 2.4.53-11.el9_2.15, mod_ldap 2.4.53-11.el9_2.15, httpd-tools 2.4.53-11.el9_2.15, mod_session 2.4.53-11.el9_2.15, +3 more Red Hat Enterprise Linux AppStream E4S (v.9.4) httpd 2.4.57-11.el9_4.5, mod_lua 2.4.57-11.el9_4.5, mod_ssl 2.4.57-11.el9_4.5, mod_ldap 2.4.57-11.el9_4.5, httpd-tools 2.4.57-11.el9_4.5, mod_session 2.4.57-11.el9_4.5, +3 more Red Hat Enterprise Linux Server (v. 7 ELS) mod_ssl 2.4.6-99.el7_9.8, httpd-tools 2.4.6-99.el7_9.8, mod_session 2.4.6-99.el7_9.8, httpd-manual 2.4.6-99.el7_9.8 Red Hat Enterprise Linux Server Optional (v. 7 ELS) mod_ldap 2.4.6-99.el7_9.8, mod_proxy_html 2.4.6-99.el7_9.8 Red Hat Hardened Images mod_lua 2.4.67-1.hum1, mod_ssl 2.4.67-1.hum1, mod_ldap 2.4.67-1.hum1, mod_session 2.4.67-1.hum1, mod_proxy_html 2.4.67-1.hum1 Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-mod_md 2.4.28-16.el7jbcs, jbcs-httpd24-nghttp2 1.64.0-3.el7jbcs, jbcs-httpd24-mod_http2 2.0.29-10.el7jbcs, jbcs-httpd24-mod_security 2.9.6-16.el7jbcs, jbcs-httpd24-mod_jk 1.2.50-14.redhat_1.el7jbcs, jbcs-httpd24-mod_proxy_cluster 1.3.22-9.el7jbcs, +1 more
    +1 more products
    Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-mod_md 2.4.28-16.el8jbcs, jbcs-httpd24-nghttp2 1.64.0-3.el8jbcs, jbcs-httpd24-mod_http2 2.0.29-10.el8jbcs, jbcs-httpd24-mod_security 2.9.6-16.el8jbcs, jbcs-httpd24-mod_jk 1.2.50-14.redhat_1.el8jbcs, jbcs-httpd24-mod_proxy_cluster 1.3.22-9.el8jbcs, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami apache
<2.4.67
2.4.67

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.