EUVD-2026-65524

NLTK: Corpus Reader Sandbox Bypass...

EUVD-2026-65526

NLTK: Corpus readers follow symlinks outside trusted roots despite pathsec enforcement...

NLTK: Quadratic CPU Exhaustion in `XMLCorpusView._read_xml_fragment()`

Summary XMLCorpusView.readxmlfragment reads a corpus file in 1 KiB blocks, appending each block to a growing fragment string, then calls VALIDXMLRE.matchfragment on the full accumulated buffer every iteration. Because each iteration rescans the entire accumulated fragment, the total amount of wor...

Linux Distros Unpatched Vulnerability : CVE-2026-81723

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 quadratic CPU exhaustion vulnerability in XMLCorpusView.readxmlfragment that rescans accumulated XML fragments on every 1...

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...

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...

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...

CVE-2026-79674

NLTK (Natural Language Toolkit) versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader , allowing them to read filesystem content and SQLite databases...

CVE-2026-79674 NLTK 3.10.2 Path Traversal via corpus-reader constructors

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-2026-79674

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...

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 via the gettag method in nltk/corpus/reader/ipipan.py, which is the single choke point for channels, domains, categories, a...

CVE-2026-62385

NLTK versions before 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit framebyname, doc, lu, and header methods wi...

PT-2026-81355

Name of the Vulnerable Software and Affected Versions NLTK versions prior to 3.10.3 Description A path sandbox bypass exists in corpus-reader constructors, enabling attackers to read files outside the intended data root. By supplying arbitrary corpus root paths to the LinThesaurusCorpusReader and...

Security update for python-nltk (important)

openSUSE Security Update: Security update for python-nltk Announcement ID: openSUSE-SU-2026:0277-1 Rating: important References: 1273252 1273254 1273255 Cross-References: CVE-2026-12061 CVE-2026-12072 CVE-2026-12074 Affected Products: openSUSE Backports SLE-15-SP7 An update that fixes three...

GHSA-FG7F-2386-8897 Natural Language Toolkit (NLTK): ReDoS in NLTK ReviewsCorpusReader FEATURES regex

Summary ReviewsCorpusReader extracts feature annotations of the form label followed by a bracketed signed digit e.g. a label then +2 from each review line, using the module-level FEATURES regex. The feature-label sub-pattern is unbounded — an optional greedy run of word-plus-whitespace groups...

GHSA-6HM5-JGCP-P838 Natural Language Toolkit (NLTK): Path Traversal in NKJPCorpusReader leads to Arbitrary File Read and bypasses the nltk.pathsec sandbox (ENFORCE=True)

Summary A path-traversal vulnerability in NKJPCorpusReader allows an attacker who can influence the fileids argument of its public read methods header, raw, words, sents, taggedwords to read files outside the corpus root. The reader builds the file path with no containment check and opens it with...

Security Bulletin: Multiple Vulnerabilities in NLTK bundled with IBM Fusion, IBM Fusion HCI, and IBM Fusion Content-Aware Storage

Summary IBM Fusion, IBM Fusion HCI, and IBM Fusion Content-Aware Storage include the Natural Language Toolkit NLTK library, which is susceptible to several critical security vulnerabilities. These flaws could allow a remote attacker to execute arbitrary code, perform arbitrary file reads via path...

📄 NLTK 3.9.2 Arbitrary File Read / Path Traversal

NLTK versions 3.9.2 and below suffer from an arbitrary file read issue due to a path traversal vulnerability. CVE-2026-0847 — NLTK Multiple CorpusReader Classes: Arbitrary File Read via Path Traversal --- Overview | Field | Details | |---|---| | CVE ID | CVE-2026-0847 | | Package | nltk Natural...

CVE-2026-0847

A flaw was found in NLTK Natural Language Toolkit. This vulnerability allows a remote attacker to read arbitrary files on the server due to improper sanitization of file paths in several CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. By...