What is CVE-2023-25166?

CVE-2023-25166 is a medium-severity vulnerability in Hapi Formula, classified under Inefficient Regular Expression Complexity. CVSS score: 5.5/10. Published 2023-02-08.

How severe is CVE-2023-25166?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Hapi Formula

CVE-2023-25166

formula is a math and string formula parser. In versions prior to 3.0.1 crafted user-provided strings to formula's parser might lead to polynomial execution time and a denial of service. Users should upgrade to 3.0.1+. There are no known workarounds for this vulnerability.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2023-02-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Hapi Formula
Hapijs Formula — versions < 3.0.1

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

github.com/hapijs/formula/security/advisories/GHSA-c2jc-4fpr-4vhg (Vendor Advisory)
github.com/hapijs/formula/commit/9fbc20a02d75ae809c37a610a57802cd1b41b3fe (Patch)

Frequently asked questions

What is CVE-2023-25166?: CVE-2023-25166 is a medium-severity vulnerability in Hapi Formula, classified under Inefficient Regular Expression Complexity. CVSS score: 5.5/10. Published 2023-02-08.
How severe is CVE-2023-25166?: Medium severity. CVSS v3 base score is 5.5 out of 10.