- Vulnerability/
- USN-7365-1
USN-7365-1: NLTK vulnerabilities
First published: Mon Mar 24 2025(Updated: )
It was discovered that NLTK contained a regex that is susceptible to catastrophic backtracking. An attacker could possibly use this issue to cause a denial of service. (CVE-2021-3842, CVE-2021-43854)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| ubuntu/python3-nltk | <3.4.5-2ubuntu0.1~esm2 | 3.4.5-2ubuntu0.1~esm2 |
| Ubuntu | =20.04 | |
| All of | ||
| ubuntu/python-nltk | <3.2.5-1ubuntu0.1+esm2 | 3.2.5-1ubuntu0.1+esm2 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/python3-nltk | <3.2.5-1ubuntu0.1+esm2 | 3.2.5-1ubuntu0.1+esm2 |
| Ubuntu | =18.04 | |
| All of | ||
| ubuntu/python-nltk | <3.1-1ubuntu0.1+esm2 | 3.1-1ubuntu0.1+esm2 |
| Ubuntu | =16.04 | |
| All of | ||
| ubuntu/python3-nltk | <3.1-1ubuntu0.1+esm2 | 3.1-1ubuntu0.1+esm2 |
| Ubuntu | =16.04 | |
| All of | ||
| ubuntu/python-nltk | <2.0~b9-0ubuntu4.1~esm4 | 2.0~b9-0ubuntu4.1~esm4 |
| Ubuntu | =14.04 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of USN-7365-1?
The severity of USN-7365-1 is categorized as capable of causing a denial of service due to catastrophic backtracking in a regex.
How do I fix USN-7365-1?
To fix USN-7365-1, upgrade the affected NLTK package to the recommended version specified in the advisory.
What software is affected by USN-7365-1?
USN-7365-1 affects multiple versions of the NLTK package across various Ubuntu distributions.
Can USN-7365-1 be exploited remotely?
Yes, USN-7365-1 can potentially be exploited remotely by an attacker to trigger a denial of service.
What versions of NLTK are vulnerable according to USN-7365-1?
According to USN-7365-1, vulnerable NLTK versions include 3.4.5, 3.2.5, 3.1, and 2.0~b9 based on the specific Ubuntu release.
- collector/usn
- source/Ubuntu
- agent/software-canonical-lookup
- agent/title
- agent/last-modified-date
- agent/references
- agent/source
- agent/description
- agent/first-publish-date
- agent/tags
- agent/softwarecombine
- agent/type
- agent/event
- package-manager/ubuntu
- vendor/ubuntu
- canonical/ubuntu
- version/ubuntu/20.04
- version/ubuntu/18.04
- version/ubuntu/16.04
- version/ubuntu/14.04