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HIGH severity

CVE-2023-22467 — luxon

HIGHFix: moment/luxon@5ab3bf6

CVE-2023-22467 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in luxon. A fix is available for luxon — see the affected versions and patch details below.

luxon.js inefficient regular expression complexity vulnerability

Also known asGHSA-3xq5-wjfh-ppjc
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk+0.07%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.23%0.93%1.64%2.35%0.7%1.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

8Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
luxonnpm
58.0Mdownloads / week

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 Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
📦npmluxon≥ 1.0.0&&< 1.28.11.28.1npm install luxon@1.28.1
📦npmluxon≥ 2.0.0&&< 2.5.22.5.2npm install luxon@2.5.2
📦npmluxon≥ 3.0.0&&< 3.2.13.2.1npm install luxon@3.2.1

Affected Products

1 product · 3 configurations
Application
luxonmomentjs
≥ 3.0.0 && < 3.2.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for luxon, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update luxon to 1.28.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-22467 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2023-22467: luxon DoS — Fixed in 1.28.1