EUVD-2026-64295

NLTK 3.9.4 through 3.10.2 contains a path traversal vulnerability in CrubadanCorpusReader. loadlangngrams joins the corpus root with crubadancode, the column-0 value read from the corpus table.txt mapping file, and opens the result with the builtin open rather than the pathsec-validated opener, s...

CVE-2026-71514

NLTK 3.9.4 through 3.10.2 contains a path traversal vulnerability in CrubadanCorpusReader._load_lang_ngrams . The function joins the corpus root with a value read from the corpus table.txt mapping file and opens the result using the builtin open() instead of the pathsec -validated opener. Because...

CVE-2026-71513

NLTK versions 3.10.0 through 3.10.2 contain a remote code execution vulnerability in the AllowlistUnpickler component (picklesec.py). The root cause is that the allowlist validation checks only the pickle module string but not the global name, enabling attackers to resolve dotted names via attrib...

EUVD-2026-64296

NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft...

EUVD-2026-63729

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

DEBIAN-CVE-2026-72818

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

CVE-2026-72818

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

CVE-2026-72818 NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

CVE-2026-72818 NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

CVE-2026-72818 NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

CVE-2026-72818

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORDRE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned in...

PT-2026-79260

The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORD RE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix a-z0-9+?:.-a-z0-9+ is unbounded. Input consisting of many alternating label separators can be partitioned i...

Linux Distros Unpatched Vulnerability : CVE-2026-12841

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - nltk - None Ubuntu Linux - Unknown description CVE-2026-12841 Note that Nessus relies on the presence of the package as reported by the vendor...

python313-nltk-3.10.2-1.1 on GA media (moderate)

python313-nltk-3.10.2-1.1 on GA media Announcement ID: openSUSE-SU-2026:11510-1 Rating: moderate Cross-References: CVE-2026-12372 Affected Products: openSUSE Tumbleweed An update that solves one vulnerability can now be installed. Description: These are all security issues fixed in the...

EUVD-2026-40240

nltk: Arbitrary File Read via Path Traversal in nltk.data.load through Percent-Encoded Sequences...

nltk: Arbitrary File Read via Path Traversal in nltk.data.load() through Percent-Encoded Sequences

Summary nltk.data.load and nltk.data.find resolve user-supplied resource names to filesystem paths using url2pathname, which decodes percent-encoded sequences e.g. %2e%2e to ... Path safety checks are performed on the raw, still-encoded string before decoding occurs. An attacker supplying %2e%2e...

Linux Distros Unpatched Vulnerability : CVE-2026-12072

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - nltk - None Ubuntu Linux - Unknown description CVE-2026-12072 Note that Nessus relies on the presence of the package as reported by the vendor...

Linux Distros Unpatched Vulnerability : CVE-2026-12074

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - nltk - None Ubuntu Linux - Unknown description CVE-2026-12074 Note that Nessus relies on the presence of the package as reported by the vendor...

Linux Distros Unpatched Vulnerability : CVE-2026-12061

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - nltk - None Ubuntu Linux - Unknown description CVE-2026-12061 Note that Nessus relies on the presence of the package as reported by the vendor...

EUVD-2026-54961

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...