CVE-2026-81727NLTK before 3.10.3 Hardlink File Overwrite via downloader

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• GitHub Security Advisory (GHSA-f794-5jv7-7672) vendor-advisoryExploitVendor Advisory
• VulnCheck Advisory: NLTK before 3.10.3 Hardlink File Overwrite via downloader third-party-advisoryThird Party Advisory