CVE-2026-80206 NLTK 3.10.2 Regular Expression Denial of Service via tgrep

NLTK before 3.10.3 contains a regular expression denial of service ReDoS vulnerability in the tgrep module. The tgrepnodeaction function compiles user-supplied regular expressions embedded in /regex/ pattern nodes and executes them via re.search against tree node labels without any validation or...

EUVD-2026-66397

NLTK before 3.10.3 contains a regular expression denial of service ReDoS vulnerability in the tgrep module. The tgrepnodeaction function compiles user-supplied regular expressions embedded in /regex/ pattern nodes and executes them via re.search against tree node labels without any validation or...

CVE-2026-80206

NLTK before 3.10.3 contains a regular expression denial of service ReDoS vulnerability in the tgrep module. The tgrepnodeaction function compiles user-supplied regular expressions embedded in /regex/ pattern nodes and executes them via re.search against tree node labels without any validation or...

CVE-2026-80205 NLTK before 3.10.0 ReDoS via Text.findall() unvalidated regex

NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall and TokenSearcher.findall methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking,...

EUVD-2026-66396

NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall and TokenSearcher.findall methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking,...

CVE-2026-80205

NLTK versions before 3.10.0 are vulnerable to a ReDoS (Regular Expression Denial of Service) in the Text.findall() and TokenSearcher.findall() methods. These methods accept user-supplied regular expressions without validation or a timeout mechanism, allowing an attacker to supply crafted patterns...

CVE-2026-80205 NLTK before 3.10.0 ReDoS via Text.findall() unvalidated regex

NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall and TokenSearcher.findall methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking,...

CVE-2026-80205

NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall and TokenSearcher.findall methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking,...

Linux Distros Unpatched Vulnerability : CVE-2026-79676

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 path traversal vulnerability in corpus readers that reopen root- derived paths using built-in open instead of...

Linux Distros Unpatched Vulnerability : CVE-2026-79674

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 path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended...

Linux Distros Unpatched Vulnerability : CVE-2026-80205

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 3.10.0 contain a regular expression denial of service vulnerability in Text.findall and TokenSearcher.findall methods that accept...

Linux Distros Unpatched Vulnerability : CVE-2026-79675

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - NLTK before 3.10.3 fails to validate JVM options passed through the per-call options parameter in the java function, allowing attackers to inject dangerous JVM...

Linux Distros Unpatched Vulnerability : CVE-2026-80206

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - NLTK before 3.10.3 contains a regular expression denial of service ReDoS vulnerability in the tgrep module. The tgrepnodeaction function compiles user-supplied...

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...

External Control of File Name or 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 External Control of File Name or Path through the CorpusReader.init constructor and the LinThesaurusCorpusReader and PanLexLiteCorpusReader...

Directory Traversal

Overview nltk is a Natural Language Toolkit NLTK is a Python package for natural language processing. Affected versions of this package are vulnerable to Directory Traversal through IPIPANCorpusReader, CrubadanCorpusReader, and LinThesaurusCorpusReader in nltk/corpus/reader/ipipan.py,...

CVE-2026-79676

NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open instead of nltk.pathsec.open, allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose...

CVE-2026-79675

NLTK before 3.10.3 fails to validate JVM options passed through the per-call options parameter in the java function, allowing attackers to inject dangerous JVM flags. Attackers can supply malicious options like -agentpath, -javaagent, or @argfile to Stanford wrapper classes to achieve arbitrary...

CVE-2026-79674

NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended data root. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader constructors to access...

CVE-2026-79676 NLTK before 3.10.3 Path Traversal via Symlink Bypass

NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open instead of nltk.pathsec.open, allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose...