Regular Expression Denial of Service in Leo Editor
Leo Editor v6.2.1 was discovered to contain a regular expression denial of service (ReDoS) vulnerability in the component plugins/importers/dart.py.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | leo | < 6.3 | 6.3 |
References
- https://github.com/leo-editor/leo-editor/issues/1597
- https://github.com/advisories/GHSA-x38q-xg2h-rxgx
- https://nvd.nist.gov/vuln/detail/CVE-2020-23478
- https://github.com/leo-editor/leo-editor/commit/029833689060ee73f1bc1708cf4b182f0c66ec8e
- https://github.com/leo-editor/leo-editor
- https://github.com/pypa/advisory-database/tree/main/vulns/leo/PYSEC-2021-338.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1333, CWE-697- Platform
- Python (PyPI)
- Package
leo- Disclosed
- 22.09.2021
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2021-338 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-x38q-xg2h-rxgx - CC BY 4.0
Vulnerability history: leo
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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