6.1

CVE-2026-33230: nltk Cross-site Scripting

CVSS: 6.1v3.1MediumAnalyzed
AliasesMGASA-2026-0082GHSA-gfwx-w7gr-fvh7PYSEC-2026-2235
Published 20-03-2026Last modified 24-03-2026
Open JSON

Vulnerability summary

CVE-2026-33230 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in nltk. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-7M4F-74J4-XJW4USN-8302-1

Timeline

  1. 20-03-2026
    PublishedVulnerability first disclosed.
  2. 24-03-2026
    Last modifiedVulnerability information updated.

Description

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_<payload>` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.08 pp

From 0.33% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Nltk

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard11 products
  • apache-beam-python-3.11-sdk< 2.71.0-r8
  • apache-beam-python-3.12-sdk< 2.71.0-r2
  • apache-beam-python-3.13-sdk< 2.71.0-r2
  • kubeflow-pipelines-visualization-server< 2.16.0-r3
  • label-studio< 1.23.0-r1
Wolfi6 products
  • kubeflow-pipelines-visualization-server< 2.16.0-r3
  • open-webui< 0.8.12-r1 | < 0.8.12-r2
  • py3-nltk< 3.9.4-r0
  • py3.11-nltk< 3.9.4-r0
  • py3.12-nltk< 3.9.4-r0
Debian1 product
  • nltkAll versions (No fix recorded) | < 3.10.0-1
Mageia1 product
  • python-nltk< 3.9.4-1.mga9
Nltk1 product
Opensuse1 product
  • python-nltk&distro=openSUSE Tumbleweed< 3.9.4-1.1
PyPI1 product
  • nltk< 3.9.4
Ubuntu1 product
  • nltk< 2.0~b9-0ubuntu4.1~esm6 | < 3.1-1ubuntu0.1+esm4 | < 3.2.5-1ubuntu0.1+esm4 | < 3.4.5-2ubuntu0.1~esm4 | < 3.7-1ubuntu0.1~esm2 | < 3.8.1-1ubuntu0.1~esm2 | All versions (No fix recorded) | < 3.9.2-1ubuntu0.1~esm2

8 vendors · 23 products

References

14 links
Show all 14 references