CVE-2026-0847
HIGHCVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Lifecycle Timeline
3Description
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.
Analysis
Unauthorized file access in NLTK through path traversal flaws in multiple CorpusReader classes (versions up to 3.9.2) allows unauthenticated attackers to read arbitrary files on affected systems, potentially exposing SSH keys, API tokens, and other sensitive data. The vulnerability affects NLP applications and machine learning APIs that process user-controlled file inputs without proper validation. …
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Remediation
Within 24 hours: Inventory all systems and applications using NLTK; identify which versions are deployed and assess if they process untrusted input. Within 7 days: Implement network segmentation to restrict NLTK application access to only necessary resources; apply input validation and sanitization filters at the application layer to reject suspicious file path patterns. …
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