CVE-2023-22963 — The personnummer implementation before 3

The personnummer implementation before 3.0.3 for Dart mishandles numbers in which the last four digits match the ^000[0-9]$ regular expression.

01What is this vulnerability?

The personnummer implementation before 3.0.3 for Dart mishandles numbers in which the last four digits match the ^000[0-9]$ regular expression.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-01-11T00:00:00.000Z
• Last modified: 2025-04-07T18:41:36.152Z

09References

• github.com — https://github.com/personnummer/dart/security/advisories/GHSA-4xh4-v2pq-jvhm
• github.com — https://github.com/advisories/GHSA-4xh4-v2pq-jvhm