CVE-2023-22467: luxon.js inefficient regular expression complexity vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-04 · updated 2026-06-17
Weakness: CWE-1333

Description

Luxon is a library for working with dates and times in JavaScript. On the 1.x branch prior to 1.38.1, the 2.x branch prior to 2.5.2, and the 3.x branch on 3.2.1, Luxon's `DateTime.fromRFC2822() has quadratic (N^2) complexity on some specific inputs. This causes a noticeable slowdown for inputs with lengths above 10k characters. Users providing untrusted data to this method are therefore vulnerable to (Re)DoS attacks. This issue also appears in Moment as CVE-2022-31129. Versions 1.38.1, 2.5.2, and 3.2.1 contain patches for this issue. As a workaround, limit the length of the input.

Affected products

moment luxon: from 1.0.0 before 1.28.1; from 2.0.0 before 2.5.2; from 3.0.0 before 3.2.1 — fixed in 1.28.1, 2.5.2, 3.2.1

How to fix

Upgrade to a fixed version: moment luxon 1.28.1, 2.5.2, 3.2.1. Check the vendor advisory for mitigations.

References

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