High severity · published Aug 25, 2026
CVE-2026-79674
NLTK 3.10.2 Path Traversal via corpus-reader constructors
8.2
CVSS
0.4%
EPSS
No
On KEV
Description
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 filesystem content and SQLite databases outside the pathsec sandbox boundary.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NL
nltk · nltk
before 3.10.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-79674
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-79674
Exploit
https://github.com/nltk/nltk/security/advisories/GHSA-3gq4-3j92-5w49
Third Party Advisory
https://www.vulncheck.com/advisories/nltk-path-traversal-via-corpus-reader-constructors
More from nltk
10.0
CVE-2026-0848
Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading
9.8
CVE-2026-79675
NLTK before 3.10.3 JVM Argument Injection via Per-Call Options
9.8
CVE-2026-79657
NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization
9.6
CVE-2026-78683
NLTK before 3.10.0 Remote Code Execution via Unsafe Pickle Deserialization
8.8
CVE-2026-71513
NLTK 3.10.0 through 3.10.2 Remote Code Execution via AllowlistUnpickler Dotted-Name Bypass