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NVD Vulnerability Details :
CVE-2026-33230
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-20 Mar, 2026 | 23:16
Updated At-23 Mar, 2026 | 19:14

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CPE Matches
nltk
nltk
>>nltk>>Versions up to 3.9.3(inclusive)
cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-79Primarysecurity-advisories@github.com
CWE ID: CWE-79
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8fsecurity-advisories@github.com
Patch
https://github.com/nltk/nltk/commit/40d0bc1d484a3458d6a63ecb5ba4957ab16ba14esecurity-advisories@github.com
Patch
https://github.com/nltk/nltk/security/advisories/GHSA-gfwx-w7gr-fvh7security-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8f
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/nltk/nltk/commit/40d0bc1d484a3458d6a63ecb5ba4957ab16ba14e
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/nltk/nltk/security/advisories/GHSA-gfwx-w7gr-fvh7
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Change History
0Changes found
Details not found