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Vulnerabilities

Vulnerability · CVE-2026-33230

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing.

Published Mar 20, 2026 · catalog updated Jun 17, 2026 · NLTK (Natural Language Toolkit)

Check if you run it

No confirmed exploitation is on record for CVE-2026-33230. EPSS is 0.41%. Act only if a listed version of NLTK (Natural Language Toolkit) is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NLTK (Natural Language Toolkit)).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.41%
Remediation
Advisory link
Affected products
cpe nltk/nltk

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, contains a reflected cross-site scripting issue in the route. A crafted URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe nltk/nltkversion unspecified

How to fix CVE-2026-33230

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33230. EPSS is 0.41%. Act only if a listed version of NLTK (Natural Language Toolkit) is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 20, 2026 · NIST NVD

    Detected

    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, contains a reflected cross-site scripting issue in the route. A crafted URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled data is reflected into HTML without esca

  2. Jun 17, 2026 · NIST NVD

    Updated

    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, contains a reflected cross-site scripting issue in the route. A crafted URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled data is reflected into HTML without esca

Sources

  • CVE.orgVulnerability recordCVE-2026-33230

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33230

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33230

    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, contains a reflected cross-site scripting issue in the `looku

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.