GHSA-2ww3-fxvq-293j
NLTK Vulnerable to REDoS
At a glance
- Published
- Updated
- CVE
- CVE-2021-3828
- Aliases
- PYSEC-2021-356
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS_V4
- 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
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · nltk | introduced 0, fixed 3.6.4 |
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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |