CVE-2026-79657

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

UBUNTU-CVE-2026-79657

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

CVE-2026-79657

NLTK (Python Natural Language Toolkit) versions before 3.10.3 are affected by a remote code execution vulnerability in its allowlisted pickle deserialization mechanism. The root cause is that the safe pickle loaders trust entire module namespaces rather than restricting to specific safe callables...

CVE-2026-79657

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

CVE-2026-79657 NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

CVE-2026-79657 NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

CVE-2026-79657 NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

CVE-2026-79657

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer.execute and...

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 urlopen process in nltk/pathsec.py. An attacker can reach internal-only HTTP resources by supplying a...

Deserialization of Untrusted Data

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Deserialization of Untrusted Data through the parse method in nltk/parse/transitionparser.py. An attacker can execute arbitrary Python code by...

Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Improper Restriction of Recursive Entity References in DTDs 'XML Entity Expansion' via the raw xml.etree.ElementTree parsing in...

Untrusted Search Path

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Untrusted Search Path through the dot2img function in nltk/parse/dependencygraph.py and the AlignedSent.reprsvg method in nltk/translate/api.py...

Duplicate Advisory: pathsec SSRF protection can be bypassed when a proxy is configured

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6ww7-3frv-cqxh. This link is maintained to preserve external references. Original Description NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen and callers...

Duplicate Advisory: [CWE-502] Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-rhp5-r9x4-f5g2. This link is maintained to preserve external references. Original Description NLTK before 3.10.0 affected versions =3.9.4 contains an unsafe pickle deserialization vulnerability in the...

Duplicate Advisory: Uncontrolled search path when invoking the Graphviz 'dot' binary (CWE-426/CWE-427)

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6hwm-xvph-95vm. This link is maintained to preserve external references. Original Description NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in...

Duplicate Advisory: Entity-expansion DoS (billion laughs) via remaining raw ElementTree parses (CWE-776)

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-97qj-x29f-37w7. This link is maintained to preserve external references. Original Description NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity...

GHSA-CRP9-R7RQ-C8CG Duplicate Advisory: pathsec SSRF protection can be bypassed when a proxy is configured

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6ww7-3frv-cqxh. This link is maintained to preserve external references. Original Description NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen and callers...

GHSA-GX65-C5HJ-VPV5 Duplicate Advisory: [CWE-502] Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-rhp5-r9x4-f5g2. This link is maintained to preserve external references. Original Description NLTK before 3.10.0 affected versions =3.9.4 contains an unsafe pickle deserialization vulnerability in the...

GHSA-54XP-3WW7-6WJG Duplicate Advisory: Uncontrolled search path when invoking the Graphviz 'dot' binary (CWE-426/CWE-427)

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6hwm-xvph-95vm. This link is maintained to preserve external references. Original Description NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in...

GHSA-JX89-3QG8-P2MR Duplicate Advisory: Entity-expansion DoS (billion laughs) via remaining raw ElementTree parses (CWE-776)

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-97qj-x29f-37w7. This link is maintained to preserve external references. Original Description NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity...