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Advisory details: gitlab / pypi/nltk/CVE-2026-79676
Advisory ID gitlab/pypi/nltk/CVE-2026-79676
Aliases CVE-2026-79676
GHSA-p4rw-rvv2-7xwr
Summary NLTK: Corpus readers follow symlinks outside trusted roots despite pathsec enforcement Several corpus readers still step outside NLTK's symlink-aware trusted-root model. They derive in-root paths from trusted corpus state, convert those paths back into plain strings, and reopen them with built-in `open()` rather than `nltk.pathsec.open()`.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (4)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 Improper Link Resolution Before File Access ('Link Following')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/pypi/nltk/CVE-2026-79676.yml
Reference id Reference type URL
https://github.com/nltk/nltk/commit/10d34b3f4fe3fec74b76527a409eb0acbac2e8ab
https://github.com/nltk/nltk/releases/tag/v3.10.3
https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3737.yaml
CVE-2026-79676 https://nvd.nist.gov/vuln/detail/CVE-2026-79676
GHSA-p4rw-rvv2-7xwr https://github.com/advisories/GHSA-p4rw-rvv2-7xwr
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://gitlab.com/gitlab-org/advisories-community/-/blob/main/pypi/nltk/CVE-2026-79676.yml
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

There are no SSVC decisions available.