Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-w5q8-6jpp-4246
Advisory ID github_osv/GHSA-w5q8-6jpp-4246
Aliases
Summary Duplicate Advisory: Corpus readers follow symlinks outside trusted roots despite pathsec enforcement ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-p4rw-rvv2-7xwr. This link is maintained to preserve external references. ## Original Description NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().
Status Published
Exploitability 0.5
Weighted Severity 7.4
Risk 3.7
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
System Score Found at
cvssv3.1 5.9 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-w5q8-6jpp-4246/GHSA-w5q8-6jpp-4246.json
cvssv4 8.2 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-w5q8-6jpp-4246/GHSA-w5q8-6jpp-4246.json
generic_textual HIGH
Reference id Reference type URL
CVE-2026-79676 https://nvd.nist.gov/vuln/detail/CVE-2026-79676
GHSA-p4rw-rvv2-7xwr Advisory https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr
nltk-before-path-traversal-via-symlink-bypass Advisory https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-w5q8-6jpp-4246/GHSA-w5q8-6jpp-4246.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-w5q8-6jpp-4246/GHSA-w5q8-6jpp-4246.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.