Medium
nltk — security advisory
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.
- Products
- nltk
- Affected versions
- 2.0~b9-0ubuntu4, 2.0~b9-0ubuntu4.1~esm2, 2.0~b9-0ubuntu4.1~esm4, 2.0~b9-0ubuntu4.1~esm5, 2.0~b9-0ubuntu4.1~esm6, 3.0.4-1, 3.0.5-1, 3.1-1, 3.1-1ubuntu0.1, 3.1-1ubuntu0.1+esm1, 3.1-1ubuntu0.1+esm2, 3.1-1ubuntu0.1+esm3, 3.1-1ubuntu0.1+esm4, 3.10.0-1, 3.10.1-1, 3.10.3-1, 3.2.4-1, 3.2.5-1, 3.2.5-1ubuntu0.1, 3.2.5-1ubuntu0.1+esm1, 3.2.5-1ubuntu0.1+esm2, 3.2.5-1ubuntu0.1+esm3, 3.2.5-1ubuntu0.1+esm4, 3.4.5-1, 3.4.5-2, 3.4.5-2ubuntu0.1~esm1, 3.4.5-2ubuntu0.1~esm2, 3.4.5-2ubuntu0.1~esm3, 3.4.5-2ubuntu0.1~esm4, 3.5-1, 3.6.5-1, 3.6.7-1, 3.7-1, 3.7-1ubuntu0.1~esm1, 3.7-1ubuntu0.1~esm2, 3.8.1-1, 3.8.1-1ubuntu0.1~esm1, 3.8.1-1ubuntu0.1~esm2, 3.9.1-2, 3.9.1-2build1, 3.9.2-1, 3.9.2-1ubuntu0.1~esm1, 3.9.2-1ubuntu0.1~esm2, 3.9.3-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-62383
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:11 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-62383
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
nltk
Fixed versions: Not specified
Complete source record
{
"id": "9733467d990363fa64dbcc32cee8cf5283fd1c353cb6517264689237c8fa2a18",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-62383",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-62383",
"summary": "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.",
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{
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"modified": "2026-10-17T13:00:31.092443490Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-62383",
"https://www.cve.org/CVERecord?id=CVE-2026-62383",
"https://github.com/nltk/nltk/security/advisories/ghsa-3hhw-38pf-pxj6",
"https://security-tracker.debian.org/tracker/cve-2026-62383",
"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/62xxx/cve-2026-62383.json",
"https://nvd.nist.gov/vuln/detail/cve-2026-62383",
"https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read"
]
},
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{
"value": "CVE-2026-62383",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360640,
"published_at": "2026-08-22T15:16:00+00:00"
}