GitHub Advisoryadvisory · PyPI
GHSA-2ww3-fxvq-293j NLTK Vulnerable to REDoS
HIGH
Official page ↗
- Aliases
- CVE-2021-3828
- Ecosystem
- PyPI
- Packages
- nltk
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-1333, CWE-697
- Reviewed
- 2021-09-28
Affected packages
• PyPI nltk: < 3.6.4 → fixed in 3.6.4
Description
The nltk package is vulnerable to ReDoS (regular expression denial of service). An attacker that is able to provide as an input to the [`_read_comparison_block()`(https://github.com/nltk/nltk/blob/23f4b1c4b4006b0cb3ec278e801029557cec4e82/nltk/corpus/reader/comparative_sents.py#L259) function in the file `nltk/corpus/reader/comparative_sents.py` may cause an application to consume an excessive amount of CPU.
Related
Alias · CVE (1)
- CVE-2021-3828 nltk is vulnerable to Inefficient Regular Expression Complexity vulnerability
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3828 advisory
- https://github.com/nltk/nltk/pull/2816 web
- https://github.com/nltk/nltk/commit/277711ab1dec729e626b27aab6fa35ea5efbd7e6 web
- https://github.com/advisories/GHSA-2ww3-fxvq-293j advisory
- https://github.com/nltk/nltk package
- https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2021-356.yaml web
- https://huntr.dev/bounties/d19aed43-75bc-4a03-91a0-4d0bb516bc32 web