CVE-2019-12401

Apache Solr vulnerable to XML Bomb

7.5 HighPublic exploitFix available

Solr versions 1.3.0 to 1.4.1, 3.1.0 to 3.6.2 and 4.0.0 to 4.10.4 are vulnerable to an XML resource consumption attack (a.k.a. Lol Bomb) via it’s update handler.?By leveraging XML DOCTYPE and ENTITY type elements, the attacker can create a pattern that will expand when the server parses the XML causing OOMs.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

8.55%Up 1.5 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2019-12401
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-776
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-12401
Updated: 2026-11-02

EUVDEUVD-2022-4413 No score

Record: EUVD-2022-4413
Updated: 2026-11-03

GitHub AdvisoriesGHSA-jq2w-w7v2-69q5 7.5

Apache Solr vulnerable to XML Bomb

Solr versions prior to 5.0.0 are vulnerable to an XML resource consumption attack (a.k.a. Lol Bomb) via it?s update handler.?By leveraging XML DOCTYPE and ENTITY type elements, the attacker can create a pattern that will expand when the server parses the XML causing OOMs.

Record: GHSA-jq2w-w7v2-69q5
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-776
Updated: 2026-11-02

OSV 7.5

Record: CVE-2019-12401
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-jq2w-w7v2-69q5 7.5

Apache Solr vulnerable to XML Bomb

Record: GHSA-jq2w-w7v2-69q5
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-776
Updated: 2026-11-02

Affected products

apache solr

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.solr:solr-core` Maven	before 5.0.0	5.0.0
`org.apache.solr:solr-core` Maven	before 5.0.0, plus listed versions 1.3.01.4.01.4.13.1.03.2.0 Show 31 moreShow less 3.3.03.4.03.5.03.6.03.6.13.6.24.0.04.0.0-ALPHA4.0.0-BETA4.1.04.10.04.10.14.10.24.10.34.10.44.2.04.2.14.3.04.3.14.4.04.5.04.5.14.6.04.6.14.7.04.7.14.7.24.8.04.8.14.9.04.9.1	5.0.0

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	mbadanoiu/CVE-2019-12401	2025-02-12

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-12401 is a high vulnerability (CVSS 7.5) in Apache Solr, published September 10, 2019. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.55%, the 95th percentile. Fixed in org.apache.solr:solr-core 5.0.0.

References

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