CVE catalog

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. In versions 3.9.3 and prior, `nlt

[CVE catalog]

Severity
Medium · CVSS 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.34% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiannltksid3.10.3-1fixed
Debiannltkforky3.10.3-1fixed
Debiannltktrixie3.9.1-2vulnerable
Debiannltkbookworm3.8-1vulnerable
PipnltkNot reportedNot reportedunknown
CpenltkNot reportedNot reportedvulnerable
CpenltkNot reported3.8.1-1ubuntu0.1~esm2fixed
Cpepython3-nltkNot reported3.8.1-1ubuntu0.1~esm2fixed
Opensusepython-nltktumbleweed3.9.4-1.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiannltksourcesid3.10.0-1not yet assignedNot reported[1131457]
Debiannltksourceforky3.10.0-1not yet assignedNot reported[1131457]
Debiannltksourcetrixie(unfixed)not yet assignedNot reported[1131457]
Debiannltksourcebookworm(unfixed)not yet assignedNot reported[1131457]
CpenltkcpeNot reported3.8.1-1ubuntu0.1~esm2Not reportedNot reportedNot reported
Cpepython3-nltkcpeNot reported3.8.1-1ubuntu0.1~esm2Not reportedNot reportedNot reported
Opensusepython-nltkrpmtumbleweed3.9.4-1.1Not reportedOPENSUSE-SU-2026:10461-1Not reported

[Debian bug #1131457]

Notes

[trixie] nltk: Minor issue [bookworm] nltk: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [python3-nltk]Affected

    Source package: [nltk]

    Details (2)

    • 3.8-1 · all · bookworm

      Affected

      nvd · nltk · debian · bookworm; nvd · nltk · debian · 12

    • 3.8-1 · all · bookworm

      Affected

      nvd · nltk · debian · bookworm; nvd · nltk · debian · 12

[Debian 13 (Trixie)]

  • [python3-nltk]Affected

    Source package: [nltk]

    Details (2)

    • 3.9.1-2 · all · trixie

      Affected

      nvd · nltk · debian · 13

    • 3.9.1-2 · all · trixie

      Affected

      nvd · nltk · debian · 13

[openSUSE Tumbleweed]

  • [python313-nltk]Unknown

    Source package: [python-nltk]

    Details (1)

    • 3.10.3-1.1 · noarch · tumbleweed

      Unknown · Fixed: 3.9.4-1.1

      Version impact unknown

      nvd · python-nltk · opensuse · tumbleweed

  • [python314-nltk]Unknown

    Source package: [python-nltk]

    Details (1)

    • 3.10.3-1.1 · noarch · tumbleweed

      Unknown · Fixed: 3.9.4-1.1

      Version impact unknown

      nvd · python-nltk · opensuse · tumbleweed

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]