CVE-2021-3828
HIGH7.5EPSS 0.43%NLTK Vulnerable to REDoS
Published: 9/29/2021Modified: 4/28/2026
Description
nltk is vulnerable to Inefficient Regular Expression Complexity
Affected packages (3)
- Debian/nltkfrom 0
- PyPI/nltkfrom 0, < 3.6.4
- PyPI/nltkfrom 0, < 277711ab1dec729e626b27aab6fa35ea5efbd7e6 | from 0, < 3.6.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (8)
- ADVISORYhttps://github.com/advisories/GHSA-2ww3-fxvq-293j
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-3828
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-3828
- PATCHhttps://github.com/nltk/nltk
- WEBhttps://github.com/nltk/nltk/commit/277711ab1dec729e626b27aab6fa35ea5efbd7e6
- WEBhttps://github.com/nltk/nltk/pull/2816
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2021-356.yaml
- WEBhttps://huntr.dev/bounties/d19aed43-75bc-4a03-91a0-4d0bb516bc32