CVE-2026-81727
High · 7.1CVSS
7.1
EPSS
0.2%
Published
Aug 27, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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