CVE-2024-41123VulnerabilityPublished 16 Sep 2024Updated 13 Oct 2026

Red Hat Security Advisory: pcs security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2024-41123· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade to 8.10.2 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 1.2% chance of exploitation in 30 days – higher than 69% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.10.2

Exploitation evidence

Disclosed: evidence found.
CVE published 1 Aug 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

Upgrade redhat/pcs to 8.10.2.

Affected software

Product	Affected	Fixed in
Red Hatredhat/pcs`pkg:rpm/redhat/pcs`Other threats	Affected =8.0.0 <8.10.2	Fixed in 8.10.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released security updates that address these vulnerabilities. Users should apply the provided patches as described in the Red Hat advisory RHSA-2024:6670 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are indicated by the vendor.

Description

Multiple denial-of-service (DoS) vulnerabilities have been identified in the rubygem-rexml library used by the pcs packages, which provide command-line configuration for Pacemaker and Corosync utilities in Red Hat Enterprise Linux 8. These vulnerabilities involve parsing XML with many specific characters, potentially causing service disruption. Red Hat has released security updates addressing these issues for various Red Hat Enterprise Linux 8 High Availability and Resilient Storage variants.

Impact

Successful exploitation of these vulnerabilities could cause denial of service by crashing or hanging the pcs service when parsing malicious XML input. This could disrupt cluster management operations relying on Pacemaker and Corosync utilities. No known exploits in the wild have been reported. The impact is rated as moderate by Red Hat.

Summary

The pcs packages in Red Hat Enterprise Linux 8 use the rubygem-rexml library for XML parsing. Three DoS vulnerabilities (CVE-2024-41123, CVE-2024-41946, CVE-2024-43398) have been found in REXML, where specially crafted XML containing many specific characters such as whitespace, >], and ]> can cause denial of service. These vulnerabilities affect multiple Red Hat Enterprise Linux 8 High Availability and Resilient Storage product variants. Red Hat has issued security updates to fix these flaws.

CWE-400Uncontrolled Resource Consumption (opens in a new tab)
Class weaknessLikelihood of exploit: High
The product does not properly control the allocation and maintenance of a limited resource.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place.
Architecture and Design
Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or; uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
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
XML Ping of the Death (opens in a new tab)
Regular Expression Exponential Blowup (opens in a new tab)
Sustained Client Engagement (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') (opens in a new tab)
Base weaknessLikelihood of exploit: MediumOWASP Top 10 A02:2025: Security Misconfiguration (opens in a new tab)
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.
Operation
If possible, prohibit the use of DTDs or use an XML parser that limits the expansion of recursive DTD entities.
Implementation
Before parsing XML files with associated DTDs, scan for recursive entity declarations and do not continue parsing potentially explosive content.
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
Exponential Data Expansion (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Oct 2026, 22:17 UTC

WeaknessesCWE-400, CWE-776

Technical details

References

Community reviews

Related threats