CVE-2025-6211: Llama index LlamaIndex Vulnerable To Data Loss Vulnerability

MODERATE
Advisory Identifier: GHSA-5hq9-5r78-2gjh
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CVSS 6.5
CWE-440
Published
Advisory Summary

CVE-2025-6211 is a MODERATE (CVSS 6.5) llamaindex vulnerable to data loss vulnerability (CWE-440: Expected Behavior Violation) affecting Llama index libraries in the PyPI ecosystem. The issue involves llamaindex vulnerable to data loss through hash collisions in its docugamireader class. Remediation is available by upgrading affected packages to version 0.12.41, 0.3.1.

CVE-2025-6211 at a Glance

CVE Identifier CVE-2025-6211
GHSA Identifier GHSA-5hq9-5r78-2gjh
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-440: Expected Behavior Violation
Affected Product Llama index
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2025-6211

To remediate this vulnerability, upgrade all affected Llama index dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

llama-index fixed: 0.12.41 
pip install llama-index>=0.12.41
llama-index-readers-docugami fixed: 0.3.1 
pip install llama-index-readers-docugami>=0.3.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show llama-index

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2025-6211, inspect your installed packages using pip:

pip show llama-index

Analyze the terminal output to locate any version of Llama index in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.12.41), your application is affected.

Note: The pip show llama-index command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-440: Expected Behavior Violation, where a feature, api, or function does not perform according to its specification. In Llama index, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

CVE-2025-6211 Affected Llama index Versions

2 component(s)
Fixed Versions:
0.12.410.3.1
Product / Package Ecosystem Affected Versions Fixed Version
llama-index
pypi/llama-index
PyPI
< 0.12.41
0.12.41
llama-index-readers-docugami
pypi/llama-index-readers-docugami
PyPI
< 0.3.1
0.3.1

References

NVD — CVE-2025-6211 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-6211
Security Fix Commit FIX COMMIT
https://github.com/run-llama/llama_index/commit/29b2e07e64ed7d302b1cc058185560b28eaa1352
Llama index Source Repository REPOSITORY
https://github.com/run-llama/llama_index
huntr.com/bounties/1a48a011-a... WEB
https://huntr.com/bounties/1a48a011-a3c5-4979-9ffc-9652280bc389

Frequently Asked Questions

What is CVE-2025-6211?
CVE-2025-6211 is a security vulnerability in Llama index involving LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class under CWE-440: Expected Behavior Violation.
Which Llama index versions are affected?
Affected versions include releases prior to 0.12.41, 0.3.1 across affected packages: llama-index, llama-index-readers-docugami.
What version fixes CVE-2025-6211?
Upgrading to 0.12.41, 0.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is llama-index affected?
Yes, llama-index is affected in releases prior to 0.12.41. Upgrade your dependency to 0.12.41 or later.
Is llama-index-readers-docugami affected?
Yes, llama-index-readers-docugami is affected in releases prior to 0.3.1. Upgrade your dependency to 0.3.1 or later.
What is the CVSS score of CVE-2025-6211?
CVE-2025-6211 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
What CWE is associated with CVE-2025-6211?
CVE-2025-6211 is classified under CWE-440: Expected Behavior Violation (A feature, API, or function does not perform according to its specification.).
How can I check PyPI dependencies for CVE-2025-6211?
Run the dependency tree command: 'pip show llama-index'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5hq9-5r78-2gjh",
  "modified" : "2025-07-10T18:45:04Z",
  "published" : "2025-07-10T15:31:27Z",
  "aliases" : [ "CVE-2025-6211" ],
  "summary" : "LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class ",
  "details" : "A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
  } ],
  "affected" : [ {
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      "ecosystem" : "PyPI",
      "name" : "llama-index"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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      }, {
        "fixed" : "0.12.41"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
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    },
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-6211"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/run-llama/llama_index/commit/29b2e07e64ed7d302b1cc058185560b28eaa1352"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/run-llama/llama_index"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.com/bounties/1a48a011-a3c5-4979-9ffc-9652280bc389"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-440" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-07-10T18:45:04Z",
    "nvd_published_at" : "2025-07-10T13:15:23Z"
  }
}