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Fencer Vulns
high 7.3

CVE-2026-29168 json

Apache HTTP Server: mod_md unrestricted OCSP response

published 2026-05-05 6 mo ago modified 2026-10-26 14 d ago also BIT-apache-2026-29168 , EUVD-2026-27321

cvss
7.3
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 50%
public exploits
0
none known

Summary

Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md via OCSP response data.

This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

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-2026-29168

  • 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

ubuntu advisories UBUNTU-CVE-2026-29168

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 hummingbird 1 2.4.68-6.hum1
  • mod_lua hummingbird 1 2.4.68-6.hum1
  • mod_ssl hummingbird 1 2.4.68-6.hum1
  • mod_ldap hummingbird 1 2.4.68-6.hum1
  • httpd-core hummingbird 1 2.4.68-6.hum1
  • httpd-tools hummingbird 1 2.4.68-6.hum1
  • mod_session hummingbird 1 2.4.68-6.hum1
  • httpd-manual hummingbird 1 2.4.68-6.hum1

red hat advisories RHSA-2026:53537RHSA-2026:57844RHSA-2026:57641RHSA-2026:57642RHSA-2026:52393RHSA-2026:30845

  • 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

  • mod_md AlmaLinux 9 1:2.4.26-2.el9_8.1
  • mod_md AlmaLinux 10 1:2.4.26-5.el10_2.1

almalinux advisories ALSA-2026:30844ALSA-2026:30845

  • mod_md Rocky Linux 10 1:2.4.26-5.el10_2.1
  • mod_md Rocky Linux 9 1:2.4.26-2.el9_8.1

rocky linux advisories RLSA-2026:30845RLSA-2026:30844

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

alpine advisories ALPINE-CVE-2026-29168

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-85995

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-2026-29168 updated cvss 7.5

httpd: mod_md: unrestricted OCSP response leads to resource exhaustion

  • Red Hat Enterprise Linux AppStream (v. 9) mod_md 2.4.26-2.el9_8.1
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:30844
  • Red Hat Enterprise Linux AppStream (v. 10) mod_md 2.4.26-5.el10_2.1
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:30845
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_md 2.4.19-1.el9_2.2
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:57642
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) mod_md 2.4.19-1.el9_4.2
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:57844
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) mod_md 2.4.26-3.el10_0.2
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:52393
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) mod_md 2.4.26-1.el9_6.2
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:57641
  • Red Hat Hardened Images httpd 2.4.68-6.hum1, mod_lua 2.4.68-6.hum1, mod_ssl 2.4.68-6.hum1, mod_ldap 2.4.68-6.hum1, httpd-core 2.4.68-6.hum1, httpd-tools 2.4.68-6.hum1, +4 more
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:53537
  • Red Hat JBoss Core Services 2.4.62.SP4
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:27201
show 3 more
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.62-13.el7jbcs, jbcs-httpd24-mod_md 2.4.28-16.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, +3 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.62-13.el8jbcs, jbcs-httpd24-mod_md 2.4.28-16.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, +3 more
    fixed: vendor fix “Disabling mod_md and restarting httpd will mitigate this flaw.” RHSA-2026:27200
  • Red Hat Enterprise Linux 8 mod_md
    not affected: component not present
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_md-debuginfo 2.4.19-1.el9_2.2, mod_md-debugsource 2.4.19-1.el9_2.2 Red Hat Enterprise Linux AppStream E4S (v.9.4) mod_md-debuginfo 2.4.19-1.el9_4.2, mod_md-debugsource 2.4.19-1.el9_4.2 Red Hat Enterprise Linux AppStream EUS (v. 10.0) mod_md-debuginfo 2.4.26-3.el10_0.2, mod_md-debugsource 2.4.26-3.el10_0.2 Red Hat Enterprise Linux AppStream EUS (v.9.6) mod_md-debuginfo 2.4.26-1.el9_6.2, mod_md-debugsource 2.4.26-1.el9_6.2 Red Hat JBoss Core Services on RHEL 7 Server 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, jbcs-httpd24-mod_jk-ap24 1.2.50-14.redhat_1.el7jbcs Red Hat JBoss Core Services on RHEL 8 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, jbcs-httpd24-mod_jk-ap24 1.2.50-14.redhat_1.el8jbcs
    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

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
OSV 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.30, <2.4.67
2.4.67

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
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.