RHSA-2026:52393: Moderate: mod_md security update
Moderate: modmd security update
Other sources
This module manages common properties of domains for one or more virtual hosts. Specifically it can use the ACME protocol to automate certificate provisioning. Certificates will be configured for managed domains and their virtual hosts automatically, including at renewal.Security Fix(es): httpd: modmd: unrestricted OCSP response leads to resource exhaustion (CVE-2026-29168) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
httpd (mod_md)to a version that resolves this vulnerability.Patch CVE-2026-29168 - Compensating control
Ensure mod_md is updated to address CVE-2026-29168 (unrestricted OCSP response leading to resource exhaustion).
Event History
Frequently Asked Questions
What is the severity of RHSA-2026:52393?
The severity of RHSA-2026:52393 is rated as medium with a risk score of 4.
How do I fix RHSA-2026:52393?
To fix RHSA-2026:52393, users should apply the available security update for the mod_md module.
What software does RHSA-2026:52393 affect?
RHSA-2026:52393 affects multiple versions of Red Hat Enterprise Linux including ARM 64, x86_64, IBM z Systems, and Power architectures.
What is mod_md in RHSA-2026:52393?
mod_md is a module that manages domain properties and automates certificate provisioning using the ACME protocol.
When was RHSA-2026:52393 published?
RHSA-2026:52393 was published on August 10, 2026.