CVE-2025-7707: llamaindex — Exploit & Fix

Description

The llama_index library version 0.12.33 sets the NLTK data directory to a subdirectory of the codebase by default, which is world-writable in multi-user environments. This configuration allows local users to overwrite, delete, or corrupt NLTK data files, leading to potential denial of service, data tampering, or privilege escalation. The vulnerability arises from the use of a shared cache directory instead of a user-specific one, making it susceptible to local data tampering and denial of service.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-377 CWE-377

Affected Products

Vendor	Product	Versions
llamaindex	llamaindex	0.12.33 — 0.13.0

References

Advisories & Patches

https://github.com/run-llama/llama_index/commit/98816394d57c7f53f847ed7b60725e69d0e7aae4

Exploits

https://huntr.com/bounties/3fe2c8ab-6727-4aef-a0ef-4d2818e48803

Frequently Asked Questions

What is CVE-2025-7707? +

The llama_index library version 0.12.33 sets the NLTK data directory to a subdirectory of the codebase by default, which is world-writable in multi-user environments. This configuration allows local users to overwrite, delete, or corrupt NLTK data files, leading to potential denial of service, data tampering, or privilege escalation. The vulnerability arises from the use of a shared cache directory instead of a user-specific one, making it susceptible to local data tampering and denial of service. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-7707? +

CVE-2025-7707 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-7707? +

CVE-2025-7707 affects products from llamaindex, specifically: llamaindex. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-7707? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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