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High

Apache Solr vulnerable to XML Bomb

  • Disclosed: 24.05.2022
  • Updated: 11.10.2026 11:22

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.

Affected software

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PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.apache.solr:solr-core < 5.0.0 5.0.0

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-776
Platform
Java / Kotlin (Maven)
Package
org.apache.solr:solr-core
Disclosed
24.05.2022
Updated
11.10.2026 11:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-jq2w-w7v2-69q5 - CC BY 4.0

Vulnerability history: org.apache.solr:solr-core

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (31) in the archive
Total entries
31
First → latest
10.2018 06.2026
Without a fix
1
Exploited in attacks
2

Severity breakdown

  • Critical 4
  • High 16
  • Medium 10
  • Low 1

Disclosures per year

Severity:
  1. Apache Solr has hardcoded credentials in the Basic Authentication setup tool
    High · 8.1 CVE-2026-44825 >= 9.4.0, <= 9.10.1, = 10.0.0 no fix
  2. Apache Solr: Insufficient file-access checking in standalone core-creation requests
    High · 7.1 CVE-2026-22444 >= 8.6.0, < 9.10.1 9.10.1
  3. Apache Solr: Unauthorized bypass of certain "predefined permission" rules in the RuleBasedAuthorizationPlugin
    High · 8.2 CVE-2026-22022 >= 5.3.0, < 9.10.1 9.10.1
  4. Apache Solr vulnerable to Execution with Unnecessary Privileges
    High CVE-2025-24814 < 9.8.0 9.8.0
  5. Apache Solr: Backup/Restore APIs allow for deployment of executables in malicious ConfigSets
    High · 8.8 CVE-2023-50386 >= 6.0.0, < 8.11.3, >= 9.0.0, < 9.4.1 8.11.3, 9.4.1
  6. Apache Solr can leak certain passwords due to System Property redaction logic inconsistencies
    High · 7.5 CVE-2023-50291 >= 6.0.0, < 8.11.3, >= 9.0.0, < 9.3.0 8.11.3, 9.3.0
  7. Apache Solr vulnerable to XML Bomb this entry
    High · 7.5 CVE-2019-12401 < 5.0.0 5.0.0
  8. Improper Restriction of XML External Entity Reference in Apache Solr
    High CVE-2012-6612 < 4.1.0 4.1.0
  9. Apache Solr insecure inter-node communication
    High · 7.5 CVE-2017-7660 >= 5.3.0, < 5.5.5, >= 6.0.0, < 6.6.0 5.5.5, 6.6.0
  10. Apache Solr Kerberos delegation token functionality flaws
    High · 7.5 CVE-2017-9803 >= 6.2.0, < 6.6.1 6.6.1
  11. Incorrect Authorization in Apache Solr
    Critical · 9.8 CVE-2020-13957 >= 6.6.0, < 8.6.3 8.6.3
  12. Improper permission handling in Apache Solr
    High · 7.5 CVE-2021-29262 < 8.8.2 8.8.2
  13. Improper Input Validation in Apache Solr
    High · 7.5 Exploited in attacks CVE-2019-17558 >= 5.0.0, < 8.4.0, >= 6.0.0, < 8.4.0, >= 7.0.0, < 8.4.0, >= 8.0.0, < 8.4.0 8.4.0
  14. Unrestricted upload of file with dangerous type in Apache Solr
    Critical · 9.8 CVE-2019-12409 >= 8.1.1, < 8.3.0 8.3.0
  15. XML External Entity (XXE) Injection in Apache Solr
    High · 7.2 Exploited in attacks CVE-2019-0193 < 8.2.0 8.2.0
  16. Server-Side Request Forgery (SSRF) in org.apache.solr:solr-core
    High · 7.5 CVE-2017-3164 >= 1.3.0, < 7.7.0 7.7.0
  17. Critical severity vulnerability that affects org.apache.solr:solr-core
    Critical · 9.8 CVE-2019-0192 >= 5.0.0, < 7.0.0, >= 6.0.0, < 7.0.0 7.0.0
  18. Improper Limitation of a Pathname ('Path Traversal') in org.apache.solr:solr-core
    High · 7.5 CVE-2017-3163 < 5.5.4, >= 6.0.0, < 6.4.1 5.5.4, 6.4.1
  19. Remote code execution occurs in Apache Solr
    Critical · 9.8 CVE-2017-12629 >= 7.0.0, < 7.1.0, >= 6.0.0, < 6.6.2, >= 5.5.0, < 5.5.5 7.1.0, 6.6.2, 5.5.5
  20. There is a XML external entity expansion (XXE) vulnerability in Apache Solr
    High · 7.5 CVE-2018-1308 >= 1.2, < 6.6.3, >= 7.0.0, < 7.3.0 6.6.3, 7.3.0

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