Vulnerability in Llamaindex
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Llamaindex
- Run-Llama Run-Llama/llama Index — versions unspecified
Weakness classification (CWE)
References
- huntr.com/bounties/3fe2c8ab-6727-4aef-a0ef-4d2818e48803 (Exploit, Third Party Advisory)
- github.com/run-llama/llama_index/commit/98816394d57c7f53f847ed7b60725e69d0e7aae4 (Patch)
Frequently asked questions
- What is CVE-2025-7707?
- CVE-2025-7707 is a high-severity vulnerability in Llamaindex, classified under Insecure Temporary File. CVSS score: 7.8/10. Published 2025-10-13.
- How severe is CVE-2025-7707?
- High severity. CVSS v3 base score is 7.8 out of 10.