CVE-2024-25126VulnerabilityPublished 16 Apr 2024Updated 28 Jun 2026

Red Hat Security Advisory: pcs security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited · 35% EPSS.

Data as of 26 Oct 2026, 07:57 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 35.3% chance of exploitation in 30 days – higher than 98% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Apr 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hatredhat/pcs`pkg:rpm/redhat/pcs`Other threats	Affected =9.2	Fixed in–

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AI-suggested

Red Hat has released updated pcs packages (version 0.11.4-7.el9_2.1) that fix the identified vulnerabilities. Users of affected Red Hat Enterprise Linux 9.2 Extended Update Support variants should apply these updates promptly. For detailed update instructions, refer to Red Hat's official article: https://access.redhat.com/articles/11258. No additional mitigation is required beyond applying the official patches.

Description

The pcs packages provide a command-line configuration system for the Pacemaker and Corosync utilities. Security Fix(es): * rubygem-rack: Denial of Service Vulnerability in Rack Content-Type Parsing (CVE-2024-25126) * rubygem-rack: Possible DoS Vulnerability with Range Header in Rack (CVE-2024-26141) * rubygem-rack: Possible Denial of Service Vulnerability in Rack Header Parsing (CVE-2024-26146) 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.

Impact

Successful exploitation of these vulnerabilities could result in denial of service conditions affecting the pcs service, potentially disrupting configuration management of Pacemaker and Corosync clusters. There are no known exploits in the wild. The impact is rated moderate by Red Hat.

Summary

The pcs packages in Red Hat Enterprise Linux 9.2 Extended Update Support include rubygem-rack, which contains three denial of service vulnerabilities: CVE-2024-25126 (content-type parsing), CVE-2024-26141 (range header handling), and CVE-2024-26146 (header parsing). These vulnerabilities could allow an attacker to cause a denial of service condition. Red Hat has issued an update (pcs-0.11.4-7.el9_2.1) that addresses these issues. The advisory rates the impact as moderate and provides updated packages for multiple architectures and variants of RHEL 9.2.

CWE-1333Inefficient Regular Expression Complexity (opens in a new tab)
Base weaknessLikelihood of exploit: High
The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
Architecture and Design
Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.
System Configuration
Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.
Implementation
Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
Attack patterns
Regular Expression Exponential Blowup (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Jun 2026, 22:51 UTC

WeaknessesCWE-1333

Technical details

References

Community reviews

Related threats