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High, CVSS 7.5amended

LlamaIndex has an XML Entity Expansion vulnerability in its sitemap parser

CVE-2025-3225GHSA-w42r-mrx7-c633

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (llama-index-readers-papers 0.3.2; llama-index 0.12.29), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2025-3225: 0.48% estimated exploitation activity in the next 30 days; percentile 41.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser of the run-llama/llamaindex repository, specifically affecting the Papers Loaders package before version 0.3.2 (in llama-index v0.10.0 and above through v0.12.29). This vulnerability allows an attacker to supply a malicious Sitemap XML, leading to a Denial of Service (DoS) by exhausting system memory and potentially causing a system crash. The issue is resolved in version 0.3.2 (in llama-index 0.12.29).

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-w42r-mrx7-c633

  2. Revision 2 · amended ·

    Amended from osv record PYSEC-2025-250

  3. Revision 1 · created ·

    Published from osv record GHSA-w42r-mrx7-c633

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-3225

Advisory: LlamaIndex has an XML Entity Expansion vulnerability in its sitemap parser
IDs: CVE-2025-3225, GHSA-w42r-mrx7-c633
Record: https://patchnext.com/advisories/cve-2025-3225 (revision 3, source checked 26 Oct 2026, 13:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: llama-index-readers-papers 0.3.2; llama-index 0.12.29. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI llama-index-readers-papers: affected < 0.3.2; fixed in 0.3.2
- PyPI llama-index: affected >= 0.12.21, < 0.12.29; fixed in 0.12.29

## Suggested inspection (read-only)
- `python -m pip show llama-index-readers-papers`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show llama-index`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on llama-index-readers-papers, llama-index.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w42r-mrx7-c633 (OSV record GHSA-w42r-mrx7-c633 lists affected ranges: PyPI llama-index-readers-papers >=0 <0.3.2 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2025-250 (OSV record PYSEC-2025-250 lists affected ranges: PyPI llama-index >=0.12.21 <0.12.29 (fixed))
- Verified: https://github.com/advisories/GHSA-w42r-mrx7-c633 (GitHub-reviewed advisory GHSA-w42r-mrx7-c633 lists affected ranges: PyPI llama-index-readers-papers >=0 <0.3.2)

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