CVE WatchAug 28, 2026

CVE-2026-78682

NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen (and callers nltk.data.load, nltk.downloader

CVSS

7.5

High

EPSS

0.2%

p16

KEV

—

Exploit Today

0-100

Published: Aug 25, 2026 · Last modified: Aug 28, 2026 · CWE-918

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-08-252026-08-27

Technical description

NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen (and callers nltk.data.load, nltk.downloader.Downloader.index/download) when an HTTP proxy is configured. pathsec.urlopen validates the requested hostname locally, but proxy-handler inheritance disables the safe HTTP/HTTPS handlers so the actual fetch is performed by the proxy against a destination that is never re-validated. An attacker can supply a validated public URL that the proxy forwards to an internal loopback-only service, allowing disclosure of internal HTTP resources, loading of forged downloader indexes, and installation of attacker-chosen package content.

Official references

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