CVE-2026-62384
NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2
Description
NLTK versions before 3.10.2 contain a symlink-based sandbox bypass in FramenetCorpusReader that allows attackers to read arbitrary XML files outside the corpus root. Attackers can place symlinks with names containing no path separators inside the corpus subdirectory, which pass the path validation guard and are resolved to files outside the intended corpus root when accessed via frame_by_name(), _lu_file(), or doc() methods.
INFO
Published Date :
Aug. 22, 2026, 3:16 p.m.
Last Modified :
Oct. 14, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update NLTK to version 3.10.2 or later.
- Review and sanitize file paths used in NLTK.
- Restrict symlink creation within corpus directories.
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-2026-62384.
| URL | Resource |
|---|---|
| https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv | Exploit Vendor Advisory |
| https://www.vulncheck.com/advisories/nltk-framenetcorpusreader-symlink-sandbox-bypass-before | Third Party Advisory |
| https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv | Exploit Vendor 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-2026-62384 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-2026-62384
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-2026-62384 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62384 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 un bypass de sandbox basado en symlink en FramenetCorpusReader que permite a los atacantes leer archivos XML arbitrarios fuera de la raíz del corpus. Los atacantes pueden colocar symlinks con nombres que no contienen separadores de ruta dentro del subdirectorio del corpus, los cuales pasan la guardia de validación de ruta y se resuelven a archivos fuera de la raíz del corpus prevista cuando se accede a ellos a través de los métodos frame_by_name(), _lu_file() o doc(). -
Initial Analysis by [email protected]
Sep. 02, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:* versions from (including) 3.10.0 up to (excluding) 3.10.2 Added Reference Type VulnCheck: https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv Types: Exploit, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/nltk-framenetcorpusreader-symlink-sandbox-bypass-before Types: Third Party Advisory Added Reference Type CISA-ADP: https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 24, 2026
Action Type Old Value New Value Added Reference https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv Added SSVC {'id': 'CVE-2026-62384', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-24T18:39:17.570737Z'} -
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 sandbox bypass in FramenetCorpusReader that allows attackers to read arbitrary XML files outside the corpus root. Attackers can place symlinks with names containing no path separators inside the corpus subdirectory, which pass the path validation guard and are resolved to files outside the intended corpus root when accessed via frame_by_name(), _lu_file(), or doc() methods. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added Reference https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv Added Reference https://www.vulncheck.com/advisories/nltk-framenetcorpusreader-symlink-sandbox-bypass-before