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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100

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
Severity65% × 45%
Exploitation2% × 40%
Automatability30% × 15%
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

Published

June 29, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jun 30, 2026
Patch available.
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(15)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
tomcat1010.1.40-1 ... 10.1.60-1 (11 versions)
  • every version on: no fix on record
—
tomcat1111.0.11-1 ... 11.0.6-1 (10 versions)
  • every version on: no fix on record
—
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 (10 versions)
  • every version up to 10.1.60-1: fixed in 10.1.60-1
—
tomcat1111.0.11-1 ... 11.0.6-1 (9 versions)
  • every version up to 11.0.24-1: fixed in 11.0.24-1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.10-1 ... 10.1.9-1 (37 versions)
  • every version on: no fix on record
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tomcat99.0.43-1 ... 9.0.70-1 (28 versions)
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× 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 217 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-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?
A fix for CVE-2026-55956 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55956 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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