CVE-2026-78437

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). 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: cisa-adp, epss
Trending — 4 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.

This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA SSVC

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%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
Patch available.
generic
https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg

Vendor Advisories for CVE-2026-78437(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
redhattomcat10-main-10.1.60-0.1.hum12026-09-16redhat
redhattomcat11-main-11.0.26-0.1.hum12026-09-16redhat

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 39× in last 7d / 62× 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. 2026-10-04 12:33 UTCVendor advisory
  2. 2026-10-04 12:33 UTCGHSA enrichment
  3. 2026-10-04 00:53 UTCEG score recompute
  4. 2026-10-04 00:53 UTCVendor advisory
  5. 2026-10-04 00:53 UTCGHSA enrichment
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-03 13:14 UTCVendor advisory
  8. 2026-10-03 13:14 UTCGHSA enrichment
  9. 2026-10-03 01:34 UTCEG score recompute
  10. 2026-10-03 01:34 UTCVendor advisory
  11. 2026-10-03 01:34 UTCGHSA enrichment
  12. 2026-10-02 13:54 UTCVendor advisory
  13. 2026-10-02 13:54 UTCGHSA enrichment
  14. 2026-10-02 02:12 UTCEG score recompute
  15. 2026-10-02 02:12 UTCVendor advisory
  16. 2026-10-02 02:12 UTCGHSA enrichment
  17. 2026-10-01 19:50 UTCEPSS rescore
  18. 2026-10-01 14:28 UTCVendor advisory
  19. 2026-10-01 14:28 UTCGHSA enrichment
  20. 2026-10-01 02:49 UTCVendor advisory
  21. 2026-10-01 02:49 UTCGHSA enrichment
  22. 2026-09-30 15:09 UTCEG score recompute
  23. 2026-09-30 15:09 UTCVendor advisory
  24. 2026-09-30 15:09 UTCGHSA enrichment
  25. 2026-09-30 03:29 UTCVendor advisory
Show 37 more
  1. 2026-09-30 03:29 UTCGHSA enrichment
  2. 2026-09-29 15:50 UTCEG score recompute
  3. 2026-09-29 15:50 UTCVendor advisory
  4. 2026-09-29 15:50 UTCGHSA enrichment
  5. 2026-09-29 15:24 UTCEPSS rescore
  6. 2026-09-29 04:08 UTCEG score recompute
  7. 2026-09-29 04:08 UTCGHSA enrichment
  8. 2026-09-28 16:28 UTCEG score recompute
  9. 2026-09-28 16:28 UTCGHSA enrichment
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-28 04:48 UTCGHSA enrichment
  12. 2026-09-27 17:09 UTCEG score recompute
  13. 2026-09-27 17:09 UTCGHSA enrichment
  14. 2026-09-27 13:48 UTCEPSS rescore
  15. 2026-09-27 05:28 UTCGHSA enrichment
  16. 2026-09-26 17:46 UTCEG score recompute
  17. 2026-09-26 17:46 UTCGHSA enrichment
  18. 2026-09-26 15:59 UTCEPSS rescore
  19. 2026-09-26 06:02 UTCEG score recompute
  20. 2026-09-26 06:01 UTCGHSA enrichment
  21. 2026-09-26 00:28 UTCEPSS rescore
  22. 2026-09-25 18:19 UTCGHSA enrichment
  23. 2026-09-25 06:29 UTCGHSA enrichment
  24. 2026-09-24 18:49 UTCEG score recompute
  25. 2026-09-24 18:49 UTCGHSA enrichment
  26. 2026-09-24 14:04 UTCEPSS rescore
  27. 2026-09-24 07:09 UTCGHSA enrichment
  28. 2026-09-23 19:29 UTCGHSA enrichment
  29. 2026-09-23 18:23 UTCGHSA enrichment
  30. 2026-09-23 17:59 UTCGHSA enrichment
  31. 2026-09-23 17:19 UTCGHSA enrichment
  32. 2026-09-23 16:40 UTCEG score recompute▲ 7.30
  33. 2026-09-23 16:39 UTCGHSA enrichment
  34. 2026-09-23 16:39 UTCMITRE cvelistV5CVSS v3 → 7.3 · severity → HIGH
  35. 2026-09-23 12:29 UTCNVD update
  36. 2026-09-23 11:31 UTCEG score recompute
  37. 2026-09-23 11:31 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-78437?
CVE-2026-78437 is a high vulnerability published on September 23, 2026. Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. Users are…
When was CVE-2026-78437 disclosed?
CVE-2026-78437 was first published on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78437 actively exploited?
CVE-2026-78437 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78437?
CVE-2026-78437 has a CVSS v3.1 base score of 7.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78437?
A fix for CVE-2026-78437 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-78437 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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