Medium severity · published Aug 22, 2026
CVE-2026-62383
nltk IPIPANCorpusReader Symlink Arbitrary File Read
5.5
CVSS
0.2%
EPSS
No
On KEV
Description
nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(), domains(), categories(), or fileids() methods with the symlink filename.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NL
nltk · nltk
3.10.0 before 3.10.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62383
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62383
Exploit
https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6
Third Party Advisory
https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read
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