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CVE-2026-0847

Path Traversal in nltk/nltk

CVSS 3.0 8.6 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-0847

Published

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-0847

Published

nltk/nltk

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nltk",
                    "product": "nltk/nltk",
                    "versions": [
                        {
                            "version": "unspecified",
                            "status": "affected",
                            "versionType": "custom",
                            "lessThanOrEqual": "latest"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON