CVE-2026-43515

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 1.1%, top 37% 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: cna:apache, epss
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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.

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

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
63.2%
KEV
Not listed

Published

May 12, 2026

Last Modified

June 4, 2026

Advisory Details (2)

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

oss-security - CVE-2026-43515: Apache Tomcat: Security constraints not correctly applied

http://www.openwall.com/lists/oss-security/2026/05/12/11
generic
https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkgmwpc6bb

Vendor Advisories for CVE-2026-43515(6)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntutomcat7-user (7.0.68-1ubuntu0.4+esm4) @ xenial2026-06-28ubuntu
ubuntutomcat11-user (11.0.18-1ubuntu0.1~esm1) @ resolute2026-06-28ubuntu
ubuntutomcat10-user (10.1.40-1ubuntu1.25.10.1) @ questing2026-06-28ubuntu
redhattomcat11-main-11.0.22-0.1.hum12026-05-05redhat

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.

Additional Vendor Advisories

(3)

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 8× in last 7d / 38× 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 140 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43515?
CVE-2026-43515 is a critical vulnerability published on May 12, 2026. Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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…
When was CVE-2026-43515 disclosed?
CVE-2026-43515 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43515 actively exploited?
CVE-2026-43515 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43515?
CVE-2026-43515 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-43515?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43515, 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.

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