NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute ...

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

• CISA KEV Not listed.
• EPSS 0.0027, the 18th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:40 UTC First seen by agentprime
2. 31 Oct 2026, 14:40 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-848c-c2cx-j7qx
• OSV: GHSA-848c-c2cx-j7qx
• github.com/nltk/nltk/releases/tag/3.9.3
• github.com/nltk/nltk/commit/66f14096d952ec8f04934f515e027534bd4eb0ac
• github.com/nltk/nltk/pull/3465
• www.vulncheck.com/advisories/nltk-eval-injection-via-collocations-py-command-line-arguments
• github.com/advisories/GHSA-848c-c2cx-j7qx

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.