CVE-2021-3828 — Regex Denial of Service in Nltk

CWE-1333 — Regex Denial of ServiceCWE-697 — Incorrect Comparison7 documents6 sources
Severity
7.5HIGHNVD
EPSS
0.4%
top 37.21%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
NltkDebian NltkNltk Nltk
Timeline
PublishedSep 27
Latest updateJun 30

Description

nltk is vulnerable to Inefficient Regular Expression Complexity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages5 packages

▶PyPInltk/nltk< 3.6.4
▶debiandebian/nltk< nltk 3.6.5-1 (bookworm)
▶Debiannltk/nltk< 3.6.5-1+2
▶NVDnltk/nltk3.6.3
▶CVEListV5nltk/nltk_nltkunspecified — 3.6.3

Patches

Patch: github.com ↗Patch: huntr.dev ↗Patch: github.com ↗

🔴Vulnerability Details

3
OSV
NLTK Vulnerable to REDoS↗2021-09-29
▶
GHSA
NLTK Vulnerable to REDoS↗2021-09-29
▶
OSV
CVE-2021-3828: nltk is vulnerable to Inefficient Regular Expression Complexity↗2021-09-27
▶

📋Vendor Advisories

2
Ubuntu
NLTK vulnerability↗2022-01-10
▶
Debian
CVE-2021-3828: nltk - nltk is vulnerable to Inefficient Regular Expression Complexity↗2021
▶

📄Research Papers

1
arXiv
Threat Assessment in Machine Learning based Systems↗2022-06-30
▶