Fluid Attacks Database

Description

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 11	nltk	=3.10.0-1 \|\| =3.10.1-1 \|\| =3.10.3-1 \|\| =3.5-1 \|\| =3.6.5-1 \|\| =3.6.7-1 \|\| =3.7-1 \|\| =3.8-1 \|\| =3.8.1-1 \|\| =3.9.1-1 \|\| =3.9.1-2 \|\| =3.9.2-1 \|\| =3.9.3-1	-
debian 12	nltk	=3.10.0-1 \|\| =3.10.1-1 \|\| =3.10.3-1 \|\| =3.8-1 \|\| =3.8.1-1 \|\| =3.9.1-1 \|\| =3.9.1-2 \|\| =3.9.2-1 \|\| =3.9.3-1	-
debian 13	nltk	=3.10.0-1 \|\| =3.10.1-1 \|\| =3.10.3-1 \|\| =3.9.1-2 \|\| =3.9.2-1 \|\| =3.9.3-1	-
debian 14	nltk	=3.9.1-2 \|\| =3.9.2-1 \|\| =3.9.3-1 \|\| >=0 <3.10.0-1	3.10.0-1

Aliases

1. CVE-2026-659152. NVD-2026-659153. OSV-DEBIAN-2026-659154. OSV-2026-659155. SECURITY-TRACKER-CVE-2026-65915

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