CVE-2026-65915
Fixed in a distro release EPSS <1%CVSS 6.5
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.
Products: nltk
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | nltk | 3.10.0 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | nltk | no fix |
| Debian 13 | nltk | no fix |
| Debian 14 | nltk | 3.10.0-1 |
| Ubuntu 26.10 | nltk | no fix |
| Ubuntu Pro 14.04 LTS | nltk | no fix |
| Ubuntu Pro 16.04 LTS | nltk | no fix |
| Ubuntu Pro 18.04 LTS | nltk | no fix |
| Ubuntu Pro 20.04 LTS | nltk | no fix |
| Ubuntu Pro 22.04 LTS | nltk | no fix |
| Ubuntu Pro 24.04 LTS | nltk | no fix |
| Ubuntu Pro 26.04 LTS | nltk | no fix |