SCAContinuous visibility into open-source risk

Container SecurityEnd-to-end container defense across the SDLC

SASTStatic application security testing for source code

Vulnerability DatabaseCVEs with metrics and fixes

Explore All Products →

The SwitchboardIntegrations Across the Security Stack

The Signal: The Moole BlogFiltering the Noise of the Cyber Underground

Moole Field Notes: Case StudiesLessons from the Digital Frontline

The BriefingFAQs & Support Logs

NewsroomNotes from the Front Line

The Zero Day DictionaryTerms & Definitions

About UsThe People Behind The Promise

Operations TheaterAdaptive Use Cases for the Frontline

CareersJoin Moole: Security that hears the future

Contact UsWrite us and we promise to get back to you

Moole Experience CenterNavigate, Learn, & Execute the Security Stack

Trust CenterBuilt on transparency. Backed by documentation.

CVE-2021-3842

Security Operations for
Modern Software

MOOLE

Our goal is simple yet ambitious: to deliver an experience where world-class security feels effortless, empowering, and deeply human.

Products

SCA
Container Security
SAST
Vulnerability Database

Resources

The Moole Blog
Case Studies
FAQs
Newsroom
The Zero Day Dictionary

Company

About Us
Use Cases
Careers
Contact Us
Moole Experience Center
Trust Center
Pricing

Connect

© 2026 MOOLE, Inc. All rights reserved.

Moole Vulnerability Database

Find real vulnerabilities before they ship

Vulnerability Database › pypi › CVE-2021-3842

High

CVE-2021-3842

nltk is vulnerable to Inefficient Regular Expression Complexity

VectorNETWORK

PublishedJan 04, 2022, 15:15

Published Bysecurity@huntr.dev

Base Score

Score7.5

Affected Versions

Package (Ecosystem)IntroducedFixedLimit

nltk(PyPI)03.6.6N/A

References

https://github.com/nltk/nltk/commit/2a50a3edc9d35f57ae42a921c621edc160877f4d
https://huntr.dev/bounties/761a761e-2be2-430a-8d92-6f74ffe9866a

Weakness Type

CWE-1333

CVSS Metrics

Base Score

7.5

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base SeverityHigh

Version

3.1

Attack Vector (AV)

NETWORK