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. - 漏洞详情

漏洞编号：CVE-2026-81727

风险等级：高危

漏洞来源：CVE

CVE 编号：CVE-2026-81727

CNNVD 编号：-

厂商/产品：- / -

影响范围：-

CWE：CWE-59

发布/更新时间：2026-08-27 / 2026-08-28

漏洞描述

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.

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