Description
This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Published: 2026-06-30
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade NLTK to the latest release that includes a fix for the traversal check (e.g., version 3.9.5 or later).
  • Configure NLTK to enforce path validation by setting pathsec.ENFORCE=True, which blocks open calls when validation fails.
  • Validate or sanitize any resource name passed to nltk.data.load() or nltk.data.find() before calling the function, rejecting percent‑encoded sequences and ensuring the path does not contain ".." components.

Generated by OpenCVE AI on June 30, 2026 at 02:20 UTC.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-m42h-3232-vpv3 nltk: Arbitrary File Read via Path Traversal in nltk.data.load() through Percent-Encoded Sequences
History

Tue, 18 Aug 2026 09:30:00 +0000

Type Values Removed Values Added
Title Path Traversal via Percent-Encoding in nltk.data.find() and nltk.data.load() nltk: NLTK: Information disclosure via path traversal vulnerability
CPEs cpe:2.3:a:nltk:nltk:3.9.4:*:*:*:*:*:*:*
Vendors & Products Nltk nltk
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 18 Aug 2026 09:00:00 +0000

Type Values Removed Values Added
Description NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but fails to account for percent-encoded traversal sequences such as `..%2f`. The `url2pathname()` function decodes these sequences after the validation step, allowing an attacker to bypass the protection. This vulnerability enables an attacker to read arbitrary files accessible to the Python process by controlling the resource name parameter passed to `nltk.data.load()` or `nltk.data.find()`. The issue affects applications that rely on NLTK for resource loading, including NLP web applications, Jupyter notebooks, and CLI tools. The default `pathsec.ENFORCE=False` setting exacerbates the impact by not blocking the file read at the `open()` stage. This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

Wed, 01 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

threat_severity

Important

Tue, 30 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 30 Jun 2026 05:15:00 +0000

Type Values Removed Values Added
First Time appeared Nltk
Nltk nltk/nltk
Vendors & Products Nltk
Nltk nltk/nltk

Tue, 30 Jun 2026 01:15:00 +0000

Type Values Removed Values Added
Description NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but fails to account for percent-encoded traversal sequences such as `..%2f`. The `url2pathname()` function decodes these sequences after the validation step, allowing an attacker to bypass the protection. This vulnerability enables an attacker to read arbitrary files accessible to the Python process by controlling the resource name parameter passed to `nltk.data.load()` or `nltk.data.find()`. The issue affects applications that rely on NLTK for resource loading, including NLP web applications, Jupyter notebooks, and CLI tools. The default `pathsec.ENFORCE=False` setting exacerbates the impact by not blocking the file read at the `open()` stage.
Title Path Traversal via Percent-Encoding in nltk.data.find() and nltk.data.load()
Weaknesses CWE-22
References
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Subscriptions

Nltk Nltk/nltk
cve-icon MITRE

Status: REJECTED

Assigner: @huntr_ai

Published:

Updated: 2026-08-18T08:33:26.727Z

Reserved: 2026-06-15T06:24:30.096Z

Link: CVE-2026-12243

cve-icon Vulnrichment

Updated:

cve-icon NVD

Status : Rejected

Published: 2026-06-30T01:16:29.063

Modified: 2026-08-18T09:16:47.450

Link: CVE-2026-12243

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-30T00:14:35Z

Links: CVE-2026-12243 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-30T05:00:03Z

Weaknesses
  • CWE-22

    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')