NLTK: Allowlisted pickle loaders still permit code execution in current source

Summary The current source tree still allows arbitrary code execution during supposedly safer allowlisted pickle loading. The allowlist trusts whole module namespaces instead of exact safe globals, so crafted pickles can invoke dangerous in-namespace callables through pickle REDUCE. Details -...

GHSA-RHP5-R9X4-F5G2 NLTK: Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution

Summary The NLTK library's TransitionParser.parse method deserializes model files using pickleload with the default restricted=False parameter, allowing arbitrary Python code execution when loading a malicious model file. The library provides a RestrictedUnpickler class for safe deserialization,...

EUVD-2026-65229

NLTK: Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution...

Undocumented-RCE-in-PLY — Updated!

Undocumented Remote Code Execution in PLY CVE‑2025‑56005 root@kitploit: CVE ID: CVE‑2025‑56005 Disclosure Date: July 1, 2025 Affected Product: PLY Python Lex‑Yacc Affected Version: 3.11 PyPI distribution Vendor: PLY Python Lex‑Yacc Affected Component: ply/yacc.py — LRTable.readpickle via...

NLTK: Default ENFORCE=False Disables All pathsec Security Controls

NLTK's pathsec.py security module defaults to ENFORCE=False line 24, which means all 8 security validation functions only emit RuntimeWarning instead of raising exceptions when violations are detected. The pathsec module was introduced as the fix for CVE-2024-39705 arbitrary code execution via...

EUVD-2026-64336

NLTK: Default ENFORCE=False Disables All pathsec Security Controls...

CVE-2026-71513

A flaw was found in NLTK. A remote attacker can achieve remote code execution by crafting untrusted transition-parser models. This vulnerability exists in the AllowlistUnpickler, which incorrectly validates only the pickle module string and not the global name. This allows attackers to bypass the...

CVE-2026-62388

A flaw was found in NLTK. The software's default settings in pathsec.py cause security checks to only issue warnings rather than actively preventing malicious actions. This allows attackers to bypass safeguards designed to prevent unauthorized access to files path traversal and the execution of...

Security Bulletin: IBM Integrated Analytics System (IIAS) is affected by a deserialization vulnerability due to PLY (Python Lex-Yacc)

Summary PLY Python Lex-Yacc is used by IBM Integrated Analytics System as a Python parsing library implementing lex and yacc tools. CVE-2025-56005 affects PLY version 3.11 due to deserialization of untrusted data CWE-502. This critical vulnerability could allow a remote attacker, without any...

bank-api-remediated

vulnbank-api — Remediated Fixed version of bank-api, built...

Linux Distros Unpatched Vulnerability : CVE-2026-79657

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific...

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...

PYSEC-2026-3735

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...

PYSEC-2026-3735

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...

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 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...

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...