GHSA-4XW3-JF9X-X7MF: nltk PyPI
Vulnerability summary
GHSA-4XW3-JF9X-X7MF is a medium (CVSS 6.9) vulnerability in nltk PyPI.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 27-08-2026PublishedVulnerability first disclosed.
- 10-09-2026Last modifiedVulnerability information updated.
Description
Duplicate Advisory: Downloader.download follows hardlinks and overwrites outside-root files ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-f794-5jv7-7672. This link is maintained to preserve external references. ## Original Description NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download and Downloader.incr_download methods that allows attackers to overwrite files outside the install root through pre-existing hardlinks. Attackers with write access to a shared downloader directory can create hardlinks pointing to outside-root files that are then overwritten during normal package extraction, mutating files outside the intended install tree.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
No EPSS score has been published for this record yet.
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
PyPI1 product
- nltk≤ 3.10.2
1 vendor · 1 product
