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 th…

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Aug 22, 2026 · NIST NVD

   Detected

   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.

2. Oct 14, 2026 · NIST NVD

   Updated

   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.

Affected

• cpe nltk/nltkversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-65915

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-65915

  30-day exploitation probability 0.4%

  first.org
• NIST NVDVulnerability recordCVE-2026-65915

  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 a

  nvd.nist.gov

References

• Exploit · github.com
• Third Party Advisory · vulncheck.com