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 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.
- Affected products
- Nltk
- CVSS 3.1
- 7.1 HIGH
- Weakness
- CWE-59
- NVD status
- Received
- Published
- 2026-08-27
CVE-2026-81727 at NVD
No indexed exploits for CVE-2026-81727 yet
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No exploit for CVE-2026-81727 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.