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 36% 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
1.2%
EPSS %ILE
67th
KEV
Not listed

Published

May 12, 2026

Last Modified

June 4, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available.
generic
https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkgmwpc6bb
generic

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

http://www.openwall.com/lists/oss-security/2026/05/12/11

Vendor Advisories for CVE-2026-43515(17)

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

Patch Availability(9)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntutomcat9-user (9.0.16-3ubuntu0.18.04.2+esm8) @ bionic2026-08-23ubuntu
ubuntutomcat7-user (7.0.68-1ubuntu0.4+esm4) @ xenial2026-08-23ubuntu
ubuntutomcat11-user (11.0.18-1ubuntu0.1~esm1) @ resolute2026-08-23ubuntu
ubuntutomcat8-user (8.0.32-1ubuntu1.13+esm2) @ xenial2026-08-23ubuntu
redhattomcat-coyote2026-07-22redhat
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
redhattomcat10-main-10.1.55-1.hum12026-05-12redhat
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

(12 across 5 ecosystems)
Debian:13(3)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb12u1 (8 versions)
  • every version up to 10.1.55-1~deb13u1: fixed in 10.1.55-1~deb13u1
—
tomcat1111.0.11-1 ... 11.0.6-1 (6 versions)
  • every version up to 11.0.22-1~deb13u1: fixed in 11.0.22-1~deb13u1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (9 versions)
  • every version up to 10.1.55-1: fixed in 10.1.55-1
—
tomcat1111.0.11-1 ... 11.0.6-1 (7 versions)
  • every version up to 11.0.22-1: fixed in 11.0.22-1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Maven(3)
PackageVulnerable rangeFix by version rangeDependents
org.apache.tomcat.embed:tomcat-embed-core11.0.0 ... 11.0.9 (42 versions)
  • every version up to 9.0.118: fixed in 9.0.118
  • 10.1.0-M1 up to 10.1.55: fixed in 10.1.55
  • 11.0.0-M1 up to 11.0.22: fixed in 11.0.22
—
org.apache.tomcat:tomcat11.0.0 ... 11.0.9 (42 versions)
  • every version up to 9.0.118: fixed in 9.0.118
  • 10.1.0-M1 up to 10.1.55: fixed in 10.1.55
  • 11.0.0-M1 up to 11.0.22: fixed in 11.0.22
—
org.apache.tomcat:tomcat-catalina11.0.0 ... 11.0.9 (42 versions)
  • every version up to 9.0.118: fixed in 9.0.118
  • 10.1.0-M1 up to 10.1.55: fixed in 10.1.55
  • 11.0.0-M1 up to 11.0.22: fixed in 11.0.22
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.10-1 ... 10.1.9-1 (33 versions)
  • every version up to 10.1.55-1~deb12u1: fixed in 10.1.55-1~deb12u1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tomcat99.0.107-0+deb11u1 ... 9.0.95-1 (34 versions)
  • every version up to 9.0.118-0+deb11u1: fixed in 9.0.118-0+deb11u1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

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 / 24× 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 278 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 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 1.2% probability of exploitation in the next 30 days (67th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43515?
CVE-2026-43515 has a CVSS base score of 9.1 (the CNA's own assessment, by apache; NVD's own analysis pending).
How do I remediate CVE-2026-43515?
A fix for CVE-2026-43515 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43515 are linked in the Vendor Advisories panel on this page.

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