Server-Side Request Forgery (SSRF) in Natural Language Toolkit - CVE-2026-78682
Published: August 24, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU144679
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-78682
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input in the nltk.pathsec.urlopen, nltk.data.load, nltk.downloader.Downloader.index, nltk.downloader.Downloader.download components. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Affected software
Natural Language Toolkit
How to mitigate CVE-2026-78682
Install updates from vendor's website.
Natural Language Toolkit - update to 3.10.3