CVE-2025-3225: An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser o

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HIGH 7.5REMOTEUPGRADE

CVE-2025-3225 is a high-severity flaw (CVSS 7.5) affecting llamaindex. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser of the run-llama/llama_index repository, specifically affecting version v0.12.21. 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 v0.12.29.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-776
Published	2025-07-07
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: llamaindex

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-07 10:15 UTCPublished CVE record published
2026-06-17 09:19 UTCUpdated Record last modified

llamaindex llamaindex UPGRADE

Affected: >= 0.12.21 and < 0.12.29

Fixed in: 0.12.29

Safe to downgrade to: a release before 0.12.21

1. Check installed version

apt-cache policy llamaindex || rpm -q llamaindex || llamaindex --version

2. UPGRADE to 0.12.29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade llamaindex

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade llamaindex

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.12.21 (Debian / Ubuntu)

apt-cache madison llamaindex sudo apt install llamaindex=<VERSION_BEFORE_0.12.21> sudo apt-mark hold llamaindex

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list llamaindex sudo dnf downgrade llamaindex-<VERSION_BEFORE_0.12.21> sudo dnf versionlock add llamaindex

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-3225?

llamaindex: upgrade to 0.12.29. Exact commands for each OS are on this page.

Is CVE-2025-3225 being exploited?

CVE-2025-3225 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-3225 affect?

CVE-2025-3225 affects llamaindex. Severity is high (CVSS 7.5). An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser of the run-llama/llama_index repository, specifically affecting version v0.12.21. This vulnerability allows an attacker to supply a

How urgent is CVE-2025-3225?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

OpenAI and LLM tools vulnerabilities

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References

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