GHSA-f833-7jw8-xwrv: nltk (CVE-2026-62384)

Package	Ecosystem	Affected	Fixed in
nltk	PyPI	>=3.10.0, <3.10.2	3.10.2

Machine-written summary

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

NLTK versions 3.10.0 up to but not including 3.10.2 are affected by a sandbox bypass in the FramenetCorpusReader. An attacker who can place a symlink inside a corpus directory, such as in a tampered or shared corpus, can cause the reader to open an XML file outside the corpus root through a normal API call, with no user interaction needed. Upgrade to NLTK 3.10.2 or later, 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
8.7	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0065, the 51st 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.