What is GHSA-8h9m-22mv-qv5r?

GHSA-8h9m-22mv-qv5r is a security advisory published by GitHub Security Advisories with High severity. Duplicate Advisory: Symlink escape in CorpusReader allows arbitrary local file read outside the corpus root

Why does GHSA-8h9m-22mv-qv5r have no CVE ID yet?

GitHub Security Advisories published this advisory directly to customers before NVD assigned a CVE ID. This is the embargo-window disclosure pattern — vendors notify customers on day 0; NVD's public record follows days to weeks later.

What is the CVSS v3 score of GHSA-8h9m-22mv-qv5r?

GHSA-8h9m-22mv-qv5r has a CVSS v3 base score of 6.2, published by GitHub Security Advisories.

Which products are affected by GHSA-8h9m-22mv-qv5r?

GHSA-8h9m-22mv-qv5r affects 1 product, including: pip/nltk:\u003c= 3.9.3.

⚠ Withdrawn by GitHub Security Advisories

Withdrawn: September 2, 2026

GHSA-8h9m-22mv-qv5rHighCVSS 6.2Disclosed before NVD

Duplicate Advisory: Symlink escape in CorpusReader allows arbitrary local file read outside the corpus root

Vendor

GitHub Security Advisories

Published

August 22, 2026

Last Modified

September 2, 2026

📋 Description

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-r6gq-whwq-mvg9. This link is maintained to preserve external references.

Original Description

NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because path validation is lexical and does not account for symlink resolution, enabling attackers to place symlinks inside the corpus root to access files outside the intended boundary.

🎯 Affected products1

pip/nltk:<= 3.9.3

🔗 References (4)

https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9
https://nvd.nist.gov/vuln/detail/CVE-2026-70626
https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader
https://github.com/advisories/GHSA-8h9m-22mv-qv5r