6.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2025-5472

CVE-2025-5472: LlamaIndex vulnerable to DoS attack through uncontrolled recursive JSON parsing

The JSONReader in run-llama/llama_index versions 0.12.28 is vulnerable to a stack overflow due to uncontrolled recursive JSON parsing. This vulnerability allows attackers to trigger a Denial of Service (DoS) by submitting deeply nested JSON structures, leading to a RecursionError and crashing applications. The root cause is the unsafe recursive traversal design and lack of depth validation, which makes the JSONReader susceptible to stack overflow when processing deeply nested JSON. This impacts the availability of services, making them unreliable and disrupting workflows. The issue is resolved in version 0.12.38.

(GitHub Advisory)

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CVE-2025-5472

CVE-2025-5472:

6.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
llama-index-core	pip	< 0.12.38	0.12.38

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the JSONReader class, specifically within the load_data method and the internal _depth_first_yield function it calls. The root cause is an uncontrolled recursion during JSON parsing. When a user provides a deeply nested JSON file and levels_back is specified, the load_data method invokes _depth_first_yield to recursively traverse the JSON tree. This function lacks a mechanism to limit the recursion depth. An attacker can craft a JSON with excessive nesting (e.g., thousands of levels), causing _depth_first_yield to call itself until it exhausts the call stack, triggering a RecursionError and crashing the service. The provided patch confirms this analysis by wrapping the logic inside load_data with a try...except RecursionError block. This doesn't fix the underlying recursive implementation but prevents the crash by catching the exception, thus mitigating the Denial of Service vulnerability.

Vulnerable functions

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Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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