CVE-2026-43513

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
37.3%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 15, 2026

Advisory Details (2)

Auto-updated May 14, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-43513: Apache Tomcat: LockOutRealm treats user names as case-sensitive

http://www.openwall.com/lists/oss-security/2026/05/12/9
generic
https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp

Vendor Advisories for CVE-2026-43513(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntutomcat9-user (9.0.16-3ubuntu0.18.04.2+esm8) @ bionic2026-06-28ubuntu
ubuntutomcat7-user (7.0.68-1ubuntu0.4+esm4) @ xenial2026-06-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 1 ecosystem)
Maven(3)
PackageVulnerable rangeFixed inDependents
org.apache.tomcat.embed:tomcat-embed-core11.0.0 ... 11.0.9 (42 versions)11.0.22—
org.apache.tomcat:tomcat11.0.0 ... 11.0.9 (42 versions)11.0.22—
org.apache.tomcat:tomcat-catalina11.0.0 ... 11.0.9 (42 versions)11.0.22—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-01 15:07 UTCEPSS rescore
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-28 02:20 UTCEG score recompute
  15. 2026-06-28 02:20 UTCVendor advisory
  16. 2026-06-27 09:30 UTCEG score recompute
  17. 2026-06-27 09:30 UTCVendor advisory
  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-26 20:54 UTCEG score recompute
  20. 2026-06-26 20:54 UTCVendor advisory
  21. 2026-06-25 22:00 UTCEG score recompute
  22. 2026-06-25 22:00 UTCVendor advisory
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-25 13:49 UTCEPSS rescore
  25. 2026-06-24 14:05 UTCEPSS rescore
Show 75 more
  1. 2026-06-23 21:33 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
  3. 2026-06-22 14:25 UTCEPSS rescore
  4. 2026-06-21 14:56 UTCEPSS rescore
  5. 2026-06-21 14:56 UTCEPSS rescore
  6. 2026-06-21 01:59 UTCEPSS rescore
  7. 2026-06-19 19:25 UTCEPSS rescore
  8. 2026-06-18 17:52 UTCEPSS rescore
  9. 2026-06-18 17:52 UTCEPSS rescore
  10. 2026-06-17 17:53 UTCEPSS rescore
  11. 2026-06-17 00:09 UTCEG score recompute
  12. 2026-06-17 00:09 UTCVendor advisory
  13. 2026-06-16 17:52 UTCEPSS rescore
  14. 2026-06-16 06:41 UTCEG score recompute
  15. 2026-06-16 06:41 UTCVendor advisory
  16. 2026-06-15 17:49 UTCEPSS rescore
  17. 2026-06-15 01:52 UTCEG score recompute
  18. 2026-06-15 01:52 UTCVendor advisory
  19. 2026-06-14 13:26 UTCEG score recompute
  20. 2026-06-14 13:26 UTCVendor advisory
  21. 2026-06-14 00:57 UTCEG score recompute
  22. 2026-06-14 00:57 UTCVendor advisory
  23. 2026-06-13 23:00 UTCEPSS rescore
  24. 2026-06-13 06:55 UTCEG score recompute
  25. 2026-06-13 06:55 UTCVendor advisory
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-12 17:48 UTCEG score recompute
  29. 2026-06-12 17:48 UTCVendor advisory
  30. 2026-06-12 05:22 UTCEG score recompute
  31. 2026-06-12 05:22 UTCVendor advisory
  32. 2026-06-11 16:57 UTCEG score recompute
  33. 2026-06-11 16:57 UTCVendor advisory
  34. 2026-06-11 14:00 UTCEPSS rescore
  35. 2026-06-11 02:54 UTCEG score recompute
  36. 2026-06-11 02:54 UTCVendor advisory
  37. 2026-06-10 22:18 UTCEPSS rescore
  38. 2026-06-10 14:27 UTCEG score recompute
  39. 2026-06-10 14:27 UTCVendor advisory
  40. 2026-06-10 13:22 UTCEPSS rescore
  41. 2026-06-10 13:22 UTCEPSS rescore
  42. 2026-06-10 02:01 UTCEG score recompute
  43. 2026-06-10 02:01 UTCVendor advisory
  44. 2026-06-09 13:35 UTCEG score recompute
  45. 2026-06-09 13:35 UTCVendor advisory
  46. 2026-06-09 01:10 UTCEG score recompute
  47. 2026-06-09 01:10 UTCVendor advisory
  48. 2026-06-08 14:17 UTCEPSS rescore
  49. 2026-06-08 14:17 UTCEPSS rescore
  50. 2026-06-08 12:42 UTCEG score recompute
  51. 2026-06-08 00:16 UTCEG score recompute
  52. 2026-06-08 00:16 UTCVendor advisory
  53. 2026-06-07 15:25 UTCEPSS rescore
  54. 2026-06-07 15:25 UTCEPSS rescore
  55. 2026-06-07 11:50 UTCEG score recompute
  56. 2026-06-07 11:50 UTCVendor advisory
  57. 2026-06-06 23:24 UTCEG score recompute
  58. 2026-06-06 23:24 UTCVendor advisory
  59. 2026-06-06 13:47 UTCEPSS rescore
  60. 2026-06-06 13:47 UTCEPSS rescore
  61. 2026-06-06 10:58 UTCEG score recompute
  62. 2026-06-06 10:58 UTCVendor advisory
  63. 2026-06-05 22:47 UTCEPSS rescore
  64. 2026-06-05 22:32 UTCEG score recompute
  65. 2026-06-05 22:32 UTCVendor advisory
  66. 2026-06-05 10:05 UTCEG score recompute
  67. 2026-06-05 06:10 UTCEPSS rescore
  68. 2026-06-05 06:10 UTCEPSS rescore
  69. 2026-06-04 21:40 UTCEG score recompute
  70. 2026-06-04 13:12 UTCEPSS rescore
  71. 2026-06-04 13:12 UTCEPSS rescore
  72. 2026-06-04 09:14 UTCEG score recompute
  73. 2026-06-03 20:48 UTCEG score recompute
  74. 2026-06-03 08:22 UTCEG score recompute
  75. 2026-06-02 20:13 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-43513?
CVE-2026-43513 is a high vulnerability published on May 12, 2026. Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions…
When was CVE-2026-43513 disclosed?
CVE-2026-43513 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43513 actively exploited?
CVE-2026-43513 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43513?
CVE-2026-43513 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-43513?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43513, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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