Inefficient Regular Expression Complexity Affecting automation-controller package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.79% (52nd percentile)

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  • Snyk IDSNYK-RHEL10-AUTOMATIONCONTROLLER-15809009
  • published29 Mar 2026
  • disclosed26 Mar 2026

Introduced: 26 Mar 2026

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

How to fix?

There is no fixed version for RHEL:10 automation-controller.

NVD Description

Note: Versions mentioned in the description apply only to the upstream automation-controller package and not the automation-controller package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1