CVE-2026-55957

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.9%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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
Severity73% × 45%
Exploitation3% × 40%
Automatability30% × 15%
EPSS PROB
2.9%
EPSS %ILE
86th
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-2026-55957: Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

http://www.openwall.com/lists/oss-security/2026/06/29/26
generic
https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh

Vendor Advisories for CVE-2026-55957(13)

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
redhattomcat-1:9.0.120-1.el8_82026-09-17redhat
redhattomcat-1:9.0.120-1.el9_62026-09-17redhat
redhattomcat-1:9.0.120-1.el8_102026-09-17redhat
redhattomcat-1:9.0.120-1.el9_22026-09-17redhat
redhattomcat-1:9.0.120-1.el9_42026-09-17redhat
redhattomcat-1:10.1.49-1.el10_02026-09-14redhat
redhattomcat9-1:9.0.120-1.el10_02026-09-14redhat
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, 10.1.46-1, 10.1.52-1~deb12u1
  • every version up to 10.1.52-1~deb13u1: fixed in 10.1.52-1~deb13u1
—
tomcat1111.0.11-1, 11.0.6-1
  • every version up to 11.0.15-1~deb13u1: fixed in 11.0.15-1~deb13u1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
tomcat10—
  • every version up to 10.1.40-1: fixed in 10.1.40-1
—
tomcat11—
  • every version up to 11.0.5-1: fixed in 11.0.5-1
—
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 (28 versions)
  • every version up to 10.1.52-1~deb12u1: fixed in 10.1.52-1~deb12u1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tomcat99.0.43-1 ... 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 5× in last 7d / 39× 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 259 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-55957?
CVE-2026-55957 is a high vulnerability published on June 29, 2026. Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1…
When was CVE-2026-55957 disclosed?
CVE-2026-55957 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-2026-55957 actively exploited?
CVE-2026-55957 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.9% probability of exploitation in the next 30 days (86th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55957?
CVE-2026-55957 has a CVSS v3.1 base score of 7.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55957?
A fix for CVE-2026-55957 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55957 are linked in the Vendor Advisories panel on this page.

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