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[USN-8302-1] NLTK vulnerabilities

Posted on 25 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8302-1
May 25, 2026

nltk vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- 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 incorrectly validated file paths when
opening files using the nltk.util module. An attacker could possibly
use this issue to obtain sensitive information. (CVE-2026-0846)

It was discovered that NLTK incorrectly validated file paths in
multiple CorpusReader classes. An attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-0847)

It was discovered that NLTK did not properly validate external
Java archive files loaded by StanfordSegmenter. An attacker
could possibly use this issue to execute arbitrary code. This
issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu
22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.
(CVE-2026-0848)

It was discovered that NLTK's WordNet browser application
incorrectly handled user-supplied input. An attacker could
possibly use this issue to perform a cross-site scripting
attack. (CVE-2026-33230)

It was discovered that NLTK's WordNet browser application did
not restrict access to the shutdown endpoint. A remote attacker
could possibly use this issue to cause a denial of service.
(CVE-2026-33231)

It was discovered that NLTK's downloader did not validate path
attributes in remote XML index files. An attacker could possibly
use this issue to create or overwrite arbitrary files.
(CVE-2026-33236)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
python3-nltk 3.9.2-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 24.04 LTS
python3-nltk 3.8.1-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 22.04 LTS
python3-nltk 3.7-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 20.04 LTS
python3-nltk 3.4.5-2ubuntu0.1~esm4
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-nltk 3.2.5-1ubuntu0.1+esm4
Available with Ubuntu Pro
python3-nltk 3.2.5-1ubuntu0.1+esm4
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python-nltk 3.1-1ubuntu0.1+esm4
Available with Ubuntu Pro
python3-nltk 3.1-1ubuntu0.1+esm4
Available with Ubuntu Pro

Ubuntu 14.04 LTS
python-nltk 2.0~b9-0ubuntu4.1~esm6
Available with Ubuntu Pro

In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-8302-1
CVE-2026-0846, CVE-2026-0847, CVE-2026-0848, CVE-2026-33230,
CVE-2026-33231, CVE-2026-33236

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