---
title: "nltk — CVE-2026-78683"
description: "An unsafe deserialisation flaw affects the PyPI package nltk. Affected versions: <= 3.9.4. Fixed from version 3.10.0."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-08-cve-2026-78683
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-08
dateModified: 2026-09-08
---
# nltk — CVE-2026-78683

An unsafe deserialisation flaw affects the PyPI package nltk. Affected versions: <= 3.9.4. Fixed from version 3.10.0.

## What to do

Update nltk to 3.10.0 or later.

| Fact | Value |
| --- | --- |
| Package | nltk |
| Ecosystem | PyPI (Python) |
| Class | Unsafe deserialisation |
| Affected versions | <= 3.9.4 |
| Fixed version | 3.10.0 |
| CVE | CVE-2026-78683 |
| GHSA | GHSA-rhp5-r9x4-f5g2 |
| Published on | September 8, 2026 |
| Severity | Critical |

## Sources

- [GitHub Security Advisory — GHSA-rhp5-r9x4-f5g2](https://github.com/advisories/GHSA-rhp5-r9x4-f5g2) — GitHub Security Advisories
- [NVD — CVE-2026-78683](https://nvd.nist.gov/vuln/detail/CVE-2026-78683) — NVD

---

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