---
id: CVE-2025-3108
aliases:
  - GHSA-m84c-4c34-28gf
  - PYSEC-2026-1564
title: >-
  LlamaIndex has Incomplete Documentation of Program Execution related to
  JsonPickleSerializer component
summary: >-
  LlamaIndex has Incomplete Documentation of Program Execution related to
  JsonPickleSerializer component
severity: medium
cvss: 5
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L'
vendor: llama-index-core
product: llama-index-core
ecosystem: pip
affected:
  - 'llama-index-core >= 0.11.15, < 0.12.41'
patched:
  - llama-index-core 0.12.41
published: '2025-07-07'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-m84c-4c34-28gf'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3108'
  - url: >-
      https://github.com/run-llama/llama_index/commit/702e4340623092fac4cf2fe95eb9465034856da3
  - url: 'https://github.com/run-llama/llama_index'
  - url: >-
      https://github.com/run-llama/llama_index/blob/v0.12.41/CHANGELOG.md#llama-index-core-01241
  - url: 'https://huntr.com/bounties/9b55a5e8-74e6-4241-b323-e360dc8b110a'
tags:
  - osv
  - pip
epss: 0.00432
epssPercentile: 0.34703
ingestedAt: '2026-07-08T18:25:51.174Z'
---

## Overview

Incomplete Documentation of Program Execution exists in the run-llama/llama_index library's JsonPickleSerializer component, affecting versions v0.12.27 through v0.12.40. This vulnerability allows remote code execution due to an insecure fallback to Python's pickle module. JsonPickleSerializer prioritizes deserialization using pickle.loads(), which can execute arbitrary code when processing untrusted data. Attackers can exploit this by crafting malicious payloads to achieve full system compromise. The root cause involves the use of an insecure fallback strategy without sufficient input validation or protective safeguards. Version 0.12.41 renames JsonPickleSerializer to PickleSerializer and adds a warning to the docs to only use PickleSerializer to deserialize safe things.

## Affected packages

- `llama-index-core >= 0.11.15, < 0.12.41`

## Remediation

Upgrade to a patched release:

- `llama-index-core 0.12.41`