Inefficient Regular Expression Complexity Affecting pcs package, versions <0:0.10.12-6.el8_6.12


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.37% (29th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL8-PCS-15519875
  • published13 Mar 2026
  • disclosed12 Dec 2025

Introduced: 12 Dec 2025

CVE-2025-67726  (opens in a new tab)
CWE-1333  (opens in a new tab)

How to fix?

Upgrade RHEL:8 pcs to version 0:0.10.12-6.el8_6.12 or higher.
This issue was patched in RHSA-2026:2469.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pcs package and not the pcs package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.

CVSS Base Scores

version 3.1