CVE-2023-22963 — personnummer
MEDIUMCVE-2023-22963 is a medium-severity (CVSS 5.3) Improper Input Validation vulnerability in personnummer. A fix is available for personnummer — see the affected versions and patch details below.
personnummer/dart vulnerable to Improper Input Validation
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-22963.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2023-22963 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
personnummerReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Pub packages — download data is not available via public APIs for these ecosystems.
Description
This vulnerability was reported to the personnummer team in June 2020. The slow response was due to locked ownership of some of the affected packages, which caused delays to update packages prior to disclosure.
The vulnerability is determined to be low severity.
Impact
This vulnerability impacts users who rely on the for last digits of personnummer to be a real personnummer.
Patches
The issue have been patched in all repositories. The following versions should be updated to as soon as possible:
C# 3.0.2
D 3.0.1
Dart 3.0.3
Elixir 3.0.0
Go 3.0.1
Java 3.3.0
JavaScript 3.1.0
Kotlin 1.1.0
Lua 3.0.1
PHP 3.0.2
Perl 3.0.0
Python 3.0.2
Ruby 3.0.1
Rust 3.0.0
Scala 3.0.1
Swift 1.0.1
If you are using any of the earlier packages, please update to latest.
Workarounds
The issue arrieses from the regular expression allowing the first three digits in the last four digits of the personnummer to be 000, which is invalid. To mitigate this without upgrading, a check on the last four digits can be made to make sure it's not 000x.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Personnummer Meta
- Email us at Personnummer Email
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🎯Pub | personnummer | all versions | 3.0.3dart pub upgrade personnummer |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for personnummer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update personnummer to 3.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-22963 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2023-22963 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2023-22963. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-22963 in your dependencies?
O3 Security finds CVE-2023-22963 across Pub dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.