GHSA-3GQM-FCW5-W839 NLTK: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

There is an SSRF vulnerability in NLTK 3.9.4's network URL validation. The validatenetworkurl function in nltk/pathsec.py fails open when DNS resolution returns an error. The resolvehostname helper at lines 193-234 catches OSError and ValueError during socket.getaddrinfo and returns an empty list...

NLTK: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

There is an SSRF vulnerability in NLTK 3.9.4's network URL validation. The validatenetworkurl function in nltk/pathsec.py fails open when DNS resolution returns an error. The resolvehostname helper at lines 193-234 catches OSError and ValueError during socket.getaddrinfo and returns an empty list...

The vulnerability of the validate_network_url() function in the NLTK library for symbolic and statistical processing allows a attacker to perform an SSRF attack.

The vulnerability of the validatenetworkurl function in the NLTK library for symbolic and statistical processing related to insufficient validation of requests on the server side. Exploiting this vulnerability could allow a malicious actor to perform an SSRF attack remotely...

SUSE CVE-2026-63311

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

Duplicate Advisory: nltk: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-3gqm-fcw5-w839. This link is maintained to preserve external references. Original Description NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the...

CVE-2026-63311 NLTK before 3.10.0 SSRF via DNS Resolution Failure

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

CVE-2026-63311

NLTK (Python NLP library) versions

The vulnerability of the validate_network_url() function in the nltk.pathsec component of the NLTK library for symbolic and statistical processing of natural language allows a attacker to perform an SSRF attack.

The vulnerability of the validatenetworkurl function in the nltk.pathsec component of the NLTK library, a software library for symbolic and statistical processing of natural language, is related to insufficient validation of requests on the server side. Exploiting this vulnerability may allow a...

Linux Distros Unpatched Vulnerability : CVE-2026-12372

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A Server-Side Request Forgery SSRF vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The nltk.pathsec.validatenetworkurl function...

PYSEC-2026-3955

A Server-Side Request Forgery SSRF vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The nltk.pathsec.validatenetworkurl function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space 100.64.0.0/1...

UBUNTU-CVE-2026-12372

A Server-Side Request Forgery SSRF vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The nltk.pathsec.validatenetworkurl function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space 100.64.0.0/1...

Server-side Request Forgery (SSRF)

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the validatenetworkurl address-policy check in nltk/pathsec.py. An attacker can make a strict-mode...

CVE-2026-12372 Server-Side Request Forgery (SSRF) in nltk/nltk

A Server-Side Request Forgery SSRF vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The nltk.pathsec.validatenetworkurl function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space 100.64.0.0/1...