CVE-2026-43512

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 33% 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: epss, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication 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 before 7.0.0. Older unsupported versions any also be affect

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
70%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 15, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-43512: Apache Tomcat: Digest authenticator will authenticate any unknown user

http://www.openwall.com/lists/oss-security/2026/05/12/8
generic
https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73

Vendor Advisories for CVE-2026-43512(16)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntutomcat10-user (10.1.40-1ubuntu1.26.04.1) @ resolute2026-08-23ubuntu
ubuntutomcat7-user (7.0.52-1ubuntu0.16+esm2) @ trusty2026-08-23ubuntu
redhatjws6-tomcat-0:10.1.49-15.redhat_00013.1.el9jws2026-07-22redhat
redhattomcat-coyote2026-07-22redhat
redhatjws7-tomcat-0:11.0.21-5.redhat_00004.1.el9jws2026-07-14redhat
redhatdevspaces/server-rhel9:17806949942026-06-10redhat
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 rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb12u1 (8 versions)10.1.55-1~deb13u1—
tomcat1111.0.11-1 ... 11.0.6-1 (6 versions)11.0.22-1~deb13u1—
tomcat9—9.0.70-2—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (9 versions)10.1.55-1—
tomcat1111.0.11-1 ... 11.0.6-1 (7 versions)11.0.22-1—
tomcat9—9.0.70-2—
Maven(3)
PackageVulnerable rangeFixed inDependents
org.apache.tomcat.embed:tomcat-embed-core11.0.0 ... 11.0.9 (42 versions)11.0.22—
org.apache.tomcat:tomcat11.0.0 ... 11.0.9 (42 versions)11.0.22—
org.apache.tomcat:tomcat-catalina11.0.0 ... 11.0.9 (42 versions)11.0.22—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
tomcat1010.1.10-1 ... 10.1.9-1 (33 versions)10.1.55-1~deb12u1—
tomcat9—9.0.70-2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tomcat99.0.107-0+deb11u1 ... 9.0.95-1 (34 versions)9.0.118-0+deb11u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 6× in last 7d / 27× 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 287 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCcovepseng/cve-2026-43512-poc
    First seen Jun 8, 2026

    Exploitability PoC for CVE-2026-43512 (Apache Tomcat Digest Authentication Bypass)

    Open source ↗

Frequently asked(5)

What is CVE-2026-43512?
CVE-2026-43512 is a critical vulnerability published on May 12, 2026. DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication 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 before 7.0.0. Older unsupported…
When was CVE-2026-43512 disclosed?
CVE-2026-43512 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43512 actively exploited?
CVE-2026-43512 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 30.3% of all scored CVEs.
What is the CVSS score of CVE-2026-43512?
CVE-2026-43512 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43512?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43512, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-43512

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