[USN-7365-1] NLTK vulnerabilities
[USN-7365-1] NLTK vulnerabilities
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Ubuntu Security Notice USN-7365-1
March 24, 2025
nltk vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in NLTK.
Software Description:
- nltk: Natural Language Toolkit
Details:
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
python3-nltk 3.4.5-2ubuntu0.1~esm2
Available with Ubuntu Pro
Ubuntu 18.04 LTS
python-nltk 3.2.5-1ubuntu0.1+esm2
Available with Ubuntu Pro
python3-nltk 3.2.5-1ubuntu0.1+esm2
Available with Ubuntu Pro
Ubuntu 16.04 LTS
python-nltk 3.1-1ubuntu0.1+esm2
Available with Ubuntu Pro
python3-nltk 3.1-1ubuntu0.1+esm2
Available with Ubuntu Pro
Ubuntu 14.04 LTS
python-nltk 2.0~b9-0ubuntu4.1~esm4
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7365-1
CVE-2021-3842, CVE-2021-43854
