CVE-2026-29168 Apache HTTP Server: mod_md unrestricted OCSP response
An attacker can cause a denial of service in Apache HTTP Server by sending unrestricted OCSP response data to the mod_md module.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29168?
CVE-2026-29168 is a high-severity denial of service vulnerability in Apache Http Server, published on 5 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-29168?
1 open source package ship an affected version, including apache. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.30 | 2.4.67 |
Linux distribution packages (25)
mod_md AlmaLinux:10 | All versions | 1:2.4.26-5.el10_2.1 |
mod_md AlmaLinux:9 | All versions | 1:2.4.26-2.el9_8.1 |
mod_md Red Hat:enterprise_linux:10.2 | All versions | 1:2.4.26-5.el10_2.1 |
mod_md-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 1:2.4.26-5.el10_2.1 |
mod_md-debugsource Red Hat:enterprise_linux:10.2 | All versions | 1:2.4.26-5.el10_2.1 |
mod_md Red Hat:enterprise_linux:9::appstream | All versions | 1:2.4.26-2.el9_8.1 |
mod_md-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 1:2.4.26-2.el9_8.1 |
mod_md-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 1:2.4.26-2.el9_8.1 |
mod_md Red Hat:enterprise_linux_eus:10.0 | All versions | 1:2.4.26-3.el10_0.2 |
httpd Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
httpd-core Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
httpd-devel Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
httpd-filesystem Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
httpd-manual Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
httpd-tools Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_ldap Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_lua Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_proxy_html Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_session Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_ssl Red Hat:hummingbird:1 | All versions | 0:2.4.68-6.hum1 |
mod_md Red Hat:rhel_e4s:9.2::appstream | All versions | 1:2.4.19-1.el9_2.2 |
mod_md Red Hat:rhel_e4s:9.4::appstream | All versions | 1:2.4.19-1.el9_4.2 |
mod_md Red Hat:rhel_eus:9.6::appstream | All versions | 1:2.4.26-1.el9_6.2 |
mod_md Rocky Linux:10 | All versions | 1:2.4.26-5.el10_2.1 |
mod_md Rocky Linux:9 | All versions | 1:2.4.26-2.el9_8.1 |
Products include Apache Http Server.
How do I fix CVE-2026-29168?
Upgrade apache to 2.4.67 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-29168 being exploited?
There is no known exploitation of CVE-2026-29168 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2026-29168, ALSA-2026:30844, ALSA-2026:30845, AZL-85871, AZL-85995, BELL-CVE-2026-29168 and 17 more.