GHSA-p4rw-rvv2-7xwr: nltk (CVE-2026-79676)

Package	Ecosystem	Affected	Fixed in
nltk	PyPI	<3.10.3	3.10.3

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

NLTK versions before 3.10.3 are affected. Corpus readers in nltk.corpus.reader.ipipan, crubadan and lin reopen files derived from trusted corpus state with plain open() instead of the symlink-aware pathsec.open(), so a symlink inside a trusted corpus root can point to a file outside it and have its contents returned through public reader methods. An attacker who can place corpus files or symlinks under a trusted data root can read outside-root content this way. Upgrade to NLTK 3.10.3, which is listed as the fixed version.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0045, the 39th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:38 UTC First seen by agentprime
31 Oct 2026, 14:38 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.