CVE-2026-55276

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.

CVSS v3
9.1
EG Score
9.1(high)
EPSS
28.8%
KEV
Not listed

Published

June 29, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-55276: Apache Tomcat: Logged effective web.xml is incomplete

http://www.openwall.com/lists/oss-security/2026/06/29/23
generic
https://lists.apache.org/thread/jy09xjlzn6r2qwvqoph8vcmf959yq68v

Vendor Advisories for CVE-2026-55276(3)

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
redhattomcat11-main-11.0.23-0.1.hum12026-06-29redhat
redhattomcat10-main-10.1.56-1.hum12026-06-24redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 95× in last 7d / 100× 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.

  1. 2026-07-07 03:02 UTCEG score recompute
  2. 2026-07-07 03:02 UTCVendor advisory
  3. 2026-07-07 03:02 UTCGHSA enrichment
  4. 2026-07-06 23:04 UTCEG score recompute
  5. 2026-07-06 23:04 UTCVendor advisory
  6. 2026-07-06 23:04 UTCGHSA enrichment
  7. 2026-07-06 19:05 UTCEG score recompute
  8. 2026-07-06 19:05 UTCVendor advisory
  9. 2026-07-06 19:05 UTCGHSA enrichment
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 15:07 UTCEG score recompute
  13. 2026-07-06 15:07 UTCVendor advisory
  14. 2026-07-06 15:07 UTCGHSA enrichment
  15. 2026-07-06 11:00 UTCEG score recompute
  16. 2026-07-06 11:00 UTCVendor advisory
  17. 2026-07-06 11:00 UTCGHSA enrichment
  18. 2026-07-06 06:42 UTCEG score recompute
  19. 2026-07-06 06:42 UTCVendor advisory
  20. 2026-07-06 06:42 UTCGHSA enrichment
  21. 2026-07-06 02:44 UTCEG score recompute
  22. 2026-07-06 02:44 UTCVendor advisory
  23. 2026-07-06 02:44 UTCGHSA enrichment
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-06 02:23 UTCEPSS rescore
Show 75 more
  1. 2026-07-05 22:46 UTCEG score recompute
  2. 2026-07-05 22:46 UTCVendor advisory
  3. 2026-07-05 22:46 UTCGHSA enrichment
  4. 2026-07-05 18:46 UTCEG score recompute
  5. 2026-07-05 18:46 UTCVendor advisory
  6. 2026-07-05 18:46 UTCGHSA enrichment
  7. 2026-07-05 14:47 UTCEG score recompute
  8. 2026-07-05 14:47 UTCVendor advisory
  9. 2026-07-05 14:47 UTCGHSA enrichment
  10. 2026-07-05 10:48 UTCEG score recompute
  11. 2026-07-05 10:48 UTCVendor advisory
  12. 2026-07-05 10:48 UTCGHSA enrichment
  13. 2026-07-05 06:50 UTCEG score recompute
  14. 2026-07-05 06:50 UTCVendor advisory
  15. 2026-07-05 06:50 UTCGHSA enrichment
  16. 2026-07-05 02:50 UTCEG score recompute
  17. 2026-07-05 02:50 UTCVendor advisory
  18. 2026-07-05 02:50 UTCGHSA enrichment
  19. 2026-07-05 02:31 UTCEPSS rescore
  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 22:52 UTCEG score recompute
  22. 2026-07-04 22:52 UTCVendor advisory
  23. 2026-07-04 22:51 UTCGHSA enrichment
  24. 2026-07-04 18:53 UTCEG score recompute
  25. 2026-07-04 18:53 UTCVendor advisory
  26. 2026-07-04 18:53 UTCGHSA enrichment
  27. 2026-07-04 14:54 UTCEG score recompute
  28. 2026-07-04 14:54 UTCVendor advisory
  29. 2026-07-04 14:54 UTCGHSA enrichment
  30. 2026-07-04 10:54 UTCEG score recompute
  31. 2026-07-04 10:54 UTCVendor advisory
  32. 2026-07-04 10:54 UTCGHSA enrichment
  33. 2026-07-04 06:56 UTCEG score recompute
  34. 2026-07-04 06:56 UTCVendor advisory
  35. 2026-07-04 06:55 UTCGHSA enrichment
  36. 2026-07-04 06:31 UTCEPSS rescore
  37. 2026-07-04 06:31 UTCEPSS rescore
  38. 2026-07-04 02:38 UTCEG score recompute
  39. 2026-07-04 02:38 UTCVendor advisory
  40. 2026-07-04 02:38 UTCGHSA enrichment
  41. 2026-07-03 22:33 UTCEG score recompute
  42. 2026-07-03 22:33 UTCVendor advisory
  43. 2026-07-03 22:33 UTCGHSA enrichment
  44. 2026-07-03 18:36 UTCEG score recompute
  45. 2026-07-03 18:36 UTCVendor advisory
  46. 2026-07-03 18:35 UTCGHSA enrichment
  47. 2026-07-03 14:37 UTCEG score recompute
  48. 2026-07-03 14:37 UTCVendor advisory
  49. 2026-07-03 14:37 UTCGHSA enrichment
  50. 2026-07-03 10:39 UTCEG score recompute
  51. 2026-07-03 10:39 UTCVendor advisory
  52. 2026-07-03 10:39 UTCGHSA enrichment
  53. 2026-07-03 06:39 UTCEG score recompute
  54. 2026-07-03 06:39 UTCVendor advisory
  55. 2026-07-03 06:39 UTCGHSA enrichment
  56. 2026-07-03 02:41 UTCEG score recompute
  57. 2026-07-03 02:41 UTCVendor advisory
  58. 2026-07-03 02:40 UTCGHSA enrichment
  59. 2026-07-02 22:42 UTCEG score recompute
  60. 2026-07-02 22:42 UTCVendor advisory
  61. 2026-07-02 22:42 UTCGHSA enrichment
  62. 2026-07-02 18:44 UTCEG score recompute
  63. 2026-07-02 18:44 UTCVendor advisory
  64. 2026-07-02 18:44 UTCGHSA enrichment
  65. 2026-07-02 14:47 UTCEG score recompute▲ 9.10
  66. 2026-07-02 14:47 UTCVendor advisory
  67. 2026-07-02 14:46 UTCGHSA enrichment
  68. 2026-07-01 15:07 UTCEPSS rescore
  69. 2026-06-30 23:22 UTCEPSS rescore
  70. 2026-06-30 16:32 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  71. 2026-06-30 00:21 UTCNVD update
  72. 2026-06-29 22:44 UTCMITRE cvelistV5
  73. 2026-06-29 21:26 UTCNVD update
  74. 2026-06-29 20:57 UTCEG score recompute
  75. 2026-06-29 20:57 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55276?
CVE-2026-55276 is a critical vulnerability published on June 29, 2026. Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from…
When was CVE-2026-55276 disclosed?
CVE-2026-55276 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55276 actively exploited?
CVE-2026-55276 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55276?
CVE-2026-55276 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55276?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55276, 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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