CVE-2026-55956

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint.

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, from 7.0.0 through 7.0.109. 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 fix the issue.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
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-2026-55956: Apache Tomcat: Security constraints for default servlet ignored method

http://www.openwall.com/lists/oss-security/2026/06/29/25
generic
https://lists.apache.org/thread/dcjdcnnnww9hhdm016hr0l7hpw1bzjfp

Vendor Advisories for CVE-2026-55956(7)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
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
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.

Affected Packages

(9 across 4 ecosystems)
Debian:13(3)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (10 versions)——
tomcat1111.0.11-1 ... 11.0.6-1 (10 versions)——
tomcat9—9.0.70-2—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (10 versions)——
tomcat1111.0.11-1 ... 11.0.6-1 (9 versions)11.0.24-1—
tomcat9—9.0.70-2—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.10-1 ... 10.1.9-1 (36 versions)——
tomcat9—9.0.70-2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tomcat99.0.43-1 ... 9.0.70-1 (28 versions)9.0.70-2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 98× 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 149 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55956?
CVE-2026-55956 is a medium vulnerability published on June 29, 2026. Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. 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-2026-55956 disclosed?
CVE-2026-55956 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-2026-55956 actively exploited?
CVE-2026-55956 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 27.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55956?
CVE-2026-55956 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55956?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55956, 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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