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Inefficient Regular Expression Complexity The advisory has been revoked - it doesn't affect any version of package pcs  (opens in a new tab)

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EPSS
0.79% (52nd percentile)

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  • Snyk IDSNYK-RHEL9-PCS-15871711
  • published1 Apr 2026
  • disclosed26 Mar 2026
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Introduced: 26 Mar 2026

CVE-2026-4926  (opens in a new tab)
CWE-1333  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pcs package and not the pcs package as distributed by RHEL.

Impact:

A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as {a}{b}{c}:z. The generated regex grows exponentially with the number of groups, causing denial of service.

Patches:

Fixed in version 8.4.0.

Workarounds:

Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

References