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, including sensitive system files and application credentials.

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History

Mon, 24 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 22 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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, including sensitive system files and application credentials.
Title NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read
First Time appeared Nltk
Nltk nltk
Weaknesses CWE-22
CPEs cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*
Vendors & Products Nltk
Nltk nltk
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-24T18:34:55.320Z

Reserved: 2026-07-16T12:13:18.733Z

Link: CVE-2026-63312

cve-icon Vulnrichment

Updated: 2026-08-24T18:34:44.368Z

cve-icon NVD

Status : Received

Published: 2026-08-22T15:16:19.367

Modified: 2026-08-24T19:16:42.383

Link: CVE-2026-63312

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-22T16:00:12Z

Weaknesses