MEDIUM 6.9 NVD
CVE-2026-81727
NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download and Downloader.incr_download methods that allows at
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.
References
- https://github.com/nltk/nltk/security/advisories/GHSA-f794-5jv7-7672
- https://www.vulncheck.com/advisories/nltk-before-3.10.3-hardlink-file-overwrite-via-downlo
- https://github.com/nltk/nltk/security/advisories/GHSA-f794-5jv7-7672
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-08-27 via NVD.
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