Critical Security Update for pcs and pcs-snmp Packages: Multiple Vulnerabilities Identified
Summary
ALSA-2025:19719: Important: pcs security update. Affects pcs versions < 0.10.18-2.el8_10.7.alma.1. Fixed in 0.10.18-2.el8_10.7.alma.1. How to fix ↓
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Background
The pcs (Pacemaker Configuration System) and pcs-snmp packages are essential tools for managing cluster configurations in high-availability environments. They provide a command-line interface for configuring and managing the Pacemaker and Corosync utilities, which are used to ensure that services remain available even in the event of hardware or software failures. These packages are widely used in enterprise environments to maintain system reliability and uptime.
Vulnerability Detail
The pcs and pcs-snmp packages have been identified with several critical vulnerabilities stemming from the underlying Rack library. These include unsafe default settings in the Rack QueryParser, which can lead to parameter limit bypass, and unbounded multipart preamble buffering that can cause denial of service (DoS) through memory exhaustion. Specifically, CVE-2025-59830 allows attackers to bypass parameter limits, while CVE-2025-61770, CVE-2025-61771, and CVE-2025-61772 highlight issues with memory management that can be exploited to exhaust system resources. CVE-2025-61919 further exacerbates this risk by allowing unbounded reads in form parsing, leading to potential service disruptions.
How To Fix
Minimum fixed version
0.10.18-2.el8_10.7.alma.1
This is the first release that contains the fix.
sudo dnf update pcsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, consider limiting the number of parameters that can be processed by the application or implementing rate limiting to mitigate the impact of potential DoS attacks until the packages can be updated.
Conclusion
The pcs and pcs-snmp packages are critical components for managing high-availability clusters, and the identified vulnerabilities pose serious risks to system stability and security. It is essential to update these packages to the latest version to mitigate potential threats. Implementing workarounds can provide temporary relief, but a permanent fix through updates is strongly recommended.
See every vulnerability recorded for pcs →
FAQ
The main vulnerabilities include unsafe default settings in Rack's QueryParser, unbounded multipart preamble buffering, and memory exhaustion issues that can lead to denial of service.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by these vulnerabilities without needing to sign up.
If immediate updates are not possible, consider implementing rate limiting or restricting the number of parameters processed by your application as a temporary workaround.
While specific exploits may not be publicly disclosed, the vulnerabilities present significant risks for denial of service and should be addressed promptly.
For more details, refer to the CVE pages associated with each vulnerability: CVE-2025-59830, CVE-2025-61770, CVE-2025-61771, CVE-2025-61772, and CVE-2025-61919.
Related vulnerabilities
Recent vulnerabilities recorded for pcs.
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