CVE-2026-81727 — NLTK before 3.10.3 Hardlink File Overwrite via downloader
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 overwr…
Published: 2026-08-27 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7