CVE-2022-31099: Uncontrolled Recursion in rulex

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-06-27 · updated 2026-06-17
Weakness: CWE-674

Description

rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, the stack may overflow, possibly enabling a Denial of Service attack. This happens when parsing an expression with several hundred levels of nesting, causing the process to abort immediately. This is a security concern for you, if your service parses untrusted rulex expressions (expressions provided by an untrusted user), and your service becomes unavailable when the process running rulex aborts due to a stack overflow. The crash is fixed in version **0.4.3**. Affected users are advised to update to this version. There are no known workarounds for this issue.

Affected products

Pomsky-Lang Pomsky: before 0.4.3 — fixed in 0.4.3

How to fix

Upgrade to a fixed version: Pomsky-Lang Pomsky 0.4.3. Check the vendor advisory for mitigations.

References

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