CVE-2026-65915

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load to read arbitrary files accessible to the...

EUVD-2026-64309

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load to read arbitrary files accessible to the...

CVE-2026-63312

NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView . The root cause is that the component calls builtins.open() directly instead of the sandboxed pathsec.open() , effectively bypassing the pathsec.ENFORCE security mechanism. An attacker who controls t...

CVE-2026-63312

NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open directly instead of pathsec.open. Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting,...

EUVD-2026-64333

NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open directly instead of pathsec.open. Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting,...

CVE-2026-63311

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

CVE-2026-63311 NLTK before 3.10.0 SSRF via DNS Resolution Failure

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

EUVD-2026-64334

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

CVE-2026-63311

NLTK (Python NLP library) versions

CVE-2026-63311 NLTK before 3.10.0 SSRF via DNS Resolution Failure

NLTK before 3.10.0 affected versions = 3.9.4 contains a server-side request forgery SSRF vulnerability in the validatenetworkurl function in nltk/pathsec.py. The resolvehostname helper catches OSError and ValueError during socket.getaddrinfo and returns an empty list; when DNS resolution fails, t...

CVE-2026-63312 NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read

NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open directly instead of pathsec.open. Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting,...

CVE-2026-63312 NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read

NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open directly instead of pathsec.open. Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting,...

CVE-2026-63310 NLTK before 3.9.3 Missing Post-Download Integrity Verification

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation...

EUVD-2026-64335

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation...

CVE-2026-63310

NLTK (Natural Language Toolkit) versions before 3.9.3 contain a missing post-download integrity verification flaw in the downloader module . After downloading packages, the module fails to validate file integrity before extraction. An attacker positioned for a man-in-the-middle attack or performi...

CVE-2026-63310 NLTK before 3.9.3 Missing Post-Download Integrity Verification

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation...

CVE-2026-63310

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation...

CVE-2026-62388 NLTK before 3.10.0 Insecure Default Configuration in pathsec.py

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only activ...

CVE-2026-62388 NLTK before 3.10.0 Insecure Default Configuration in pathsec.py

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only activ...

EUVD-2026-64336

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only activ...