MEDIUMUnknown →
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
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.
Affected packages
- nltk
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://www.cve.org/CVERecord?id=CVE-2026-63312
- https://github.com/nltk/nltk/security/advisories/ghsa-x5ph-mj9p-rfr8
- https://security-tracker.debian.org/tracker/cve-2026-63312
- https://github.com/cveproject/cvelistv5/tree/main/cves/2026/63xxx/cve-2026-63312.json
- https://nvd.nist.gov/vuln/detail/cve-2026-63312
- https://www.vulncheck.com/advisories/nltk-streambackedcorpusview-bypasses-pathsec-enforce-arbitrary-file-read
Structured record: https://ubuntu.com/security/CVE-2026-63312
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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