CVE-2026-62383
nltk IPIPANCorpusReader Symlink Arbitrary File Read
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.
INFO
Published Date :
Aug. 22, 2026, 3:16 p.m.
Last Modified :
Oct. 14, 2026, 1:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update NLTK to version 3.10.2 or later.
- Remove any malicious symlinks from corpus root.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-62383.
| URL | Resource |
|---|---|
| https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6 | Exploit Mitigation Vendor Advisory |
| https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-62383 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-62383
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-62383 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62383 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Translation Title: nltk, Description: Las versiones de nltk anteriores a la 3.10.2 contienen una vulnerabilidad de lectura arbitraria de archivos basada en symlink en los métodos de IPIPANCorpusReader que omiten por completo la validación de nltk.pathsec. Los atacantes pueden colocar un symlink en el directorio raíz del corpus y leer archivos arbitrarios accesibles para el proceso al llamar a los métodos channels(), domains(), categories() o fileids() con el nombre de archivo del symlink. -
Reanalysis by [email protected]
Aug. 27, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:* versions up to (excluding) 3.10.2 OR *cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:* versions from (including) 3.10.0 up to (excluding) 3.10.2 -
Initial Analysis by [email protected]
Aug. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:* versions up to (excluding) 3.10.2 Added Reference Type VulnCheck: https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6 Types: Exploit, Mitigation, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read Types: Third Party Advisory -
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6 Added Reference https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read Removed Reference https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6 Removed Reference https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-62383', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-26T15:55:30.683365Z'} -
New CVE Received by [email protected]
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'nltk', 'product': 'nltk', 'versions': [{'status': 'affected', 'version': '3.10.0', 'lessThan': '3.10.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3.10.2', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/nltk', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added Reference https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6 Added Reference https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read