CVE-2025-3225Public exploitNetwork attack vector

Service crash via recursive sitemap entity expansion

Published Jul 7, 2025 · Updated Jul 7, 2025

XML entity expansion in LlamaIndex 0.12.21 allows remote attackers to exhaust process memory and crash sitemap-consuming services. SitemapReader._parse_sitemap passes attacker-controlled sitemap XML to xml.etree.ElementTree.fromstring, which expands recursive DTD entities without a resource limit. Exploitation requires an application to fetch or accept an attacker-controlled sitemap; processing it can exhaust memory and terminate the hosting process.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML entity expansion in LlamaIndex 0.12.21 allows remote attackers to exhaust process memory and crash sitemap-consuming services. SitemapReader._parse_sitemap passes attacker-controlled sitemap XML to xml.etree.ElementTree.fromstring, which expands recursive DTD entities without a resource limit. Exploitation requires an application to fetch or accept an attacker-controlled sitemap; processing it can exhaust memory and terminate the hosting process.

The record

CVE
CVE-2025-3225
Published
Jul 7, 2025
Updated
Jul 7, 2025
Vendor
LlamaIndex
Product
LlamaIndex
Classifications
CWE-776, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <v0.12.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LlamaIndex · LlamaIndexversion=unspecified <v0.12.29

Published CVSS scores

7.5huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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