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6.9 Medium

CVE-2026-81727 NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download and…

Description

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 and versions

Product Affected versions Fixed in
nltk 3.10 earliest → < 3.10.3 3.10.3

References

Timeline

  1. Published
  2. Last modified

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