Critical Security Update for mod_md: Addressing CVE-2026-29168
Summary
RHSA-2026:57642: Red Hat Security Advisory: mod_md security update. Affects mod_md versions < 1:2.4.19-1.el9_2.2. Fixed in 1:2.4.19-1.el9_2.2. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
Background
mod_md is an Apache module that automates the management of Let's Encrypt SSL certificates for web servers. It simplifies the process of obtaining and renewing certificates, ensuring secure communications over the internet. However, a recent vulnerability has been identified that could potentially compromise the security of systems utilizing this module.
Vulnerability Detail
The vulnerability identified as CVE-2026-29168 affects mod_md versions prior to 1:2.4.19-1.el9_2.2. It allows unauthorized access to sensitive information, which could lead to data breaches or unauthorized actions on the server. The vulnerability arises from improper handling of certain requests, making it critical for users to address it promptly to safeguard their systems.
How To Fix
Minimum fixed version
1:2.4.19-1.el9_2.2
This is the first release that contains the fix.
sudo dnf update mod_mdTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can restrict access to the mod_md module by configuring their firewall to block unauthorized requests until the package is updated. This can be done by adding rules to the firewall configuration to limit access to trusted IP addresses only.
Conclusion
The mod_md package has a critical vulnerability (CVE-2026-29168) that needs immediate attention. Users are advised to update to the patched version to ensure their systems remain secure. Implementing temporary workarounds can help mitigate risks until the update is applied.
See every vulnerability recorded for mod_md →
FAQ
CVE-2026-29168 is a security vulnerability affecting the mod_md package that could allow unauthorized access to sensitive information.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
If an immediate update is not possible, consider implementing firewall rules to restrict access to the mod_md module as a temporary workaround.
The CVSS score of this vulnerability is 7.5, indicating a high level of severity.
More information about mod_md can be found in the official Apache documentation and security advisories.
Related vulnerabilities
Recent vulnerabilities recorded for mod_md.
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
