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 61% 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
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 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)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
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(7)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntutomcat7-user (7.0.68-1ubuntu0.4+esm4) @ xenial2026-08-23ubuntu
ubuntutomcat10-user (10.1.40-1ubuntu1.26.04.1) @ resolute2026-08-23ubuntu
redhattomcat11-main-11.0.24-0.2.hum12026-07-23redhat
redhattomcat10-main-10.1.57-3.1.hum12026-07-23redhat
redhattomcat-catalina2026-07-22redhat
redhatjws6-tomcat-0:10.1.49-15.redhat_00013.1.el9jws2026-07-22redhat
redhatjws7-tomcat-0:11.0.21-5.redhat_00004.1.el9jws2026-07-14redhat

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

(12 across 5 ecosystems)
Debian:13(3)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb12u1 (8 versions)10.1.55-1~deb13u1—
tomcat1111.0.11-1 ... 11.0.6-1 (6 versions)11.0.22-1~deb13u1—
tomcat9—9.0.70-2—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (9 versions)10.1.55-1—
tomcat1111.0.11-1 ... 11.0.6-1 (7 versions)11.0.22-1—
tomcat9—9.0.70-2—
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—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.10-1 ... 10.1.9-1 (33 versions)10.1.55-1~deb12u1—
tomcat9—9.0.70-2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tomcat99.0.107-0+deb11u1 ... 9.0.95-1 (34 versions)9.0.118-0+deb11u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 63× 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 171 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 61.6% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-43513

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