CVE-2026-78605

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH confidence

Score 5.9 from GitHub Security Advisory published 2026-09-01. a secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') (CWE-444) in Elasticsearch can lead to information disclosure via HTTP Request Smuggling (CAPEC-33). Under specific proxy deployment configurations, a network attacker could obtain confidential responses intended for other authenticated users.

CVSS v3
5.9
EG Score
5.9(high)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 2, 2026

Advisory Details (1)

Auto-updated Sep 1, 2026
No patch confirmed yet.
generic

Elasticsearch 8.19.20, 9.4.5, 9.5.1 Security Update (ESA-2026-141) - Security Announcements - Discuss the Elastic Stack

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-141/390092

Vendor Advisories for CVE-2026-78605(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 47× 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. 2026-09-19 12:04 UTCEG score recompute
  2. 2026-09-19 12:04 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:05 UTCEG score recompute
  5. 2026-09-18 11:05 UTCGHSA enrichment
  6. 2026-09-17 10:06 UTCEG score recompute
  7. 2026-09-17 10:06 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 09:06 UTCEG score recompute
  10. 2026-09-16 09:06 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 07:02 UTCEG score recompute
  13. 2026-09-15 07:02 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 06:02 UTCEG score recompute
  17. 2026-09-14 06:02 UTCGHSA enrichment
  18. 2026-09-13 05:03 UTCEG score recompute
  19. 2026-09-13 05:03 UTCGHSA enrichment
  20. 2026-09-12 04:04 UTCEG score recompute
  21. 2026-09-12 04:04 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 03:05 UTCEG score recompute
  25. 2026-09-11 03:04 UTCGHSA enrichment
Show 22 more
  1. 2026-09-10 02:05 UTCGHSA enrichment
  2. 2026-09-09 01:05 UTCEG score recompute
  3. 2026-09-09 01:05 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-08 00:06 UTCEG score recompute
  6. 2026-09-08 00:06 UTCGHSA enrichment
  7. 2026-09-06 23:07 UTCEG score recompute
  8. 2026-09-06 23:06 UTCGHSA enrichment
  9. 2026-09-06 13:48 UTCEPSS rescore
  10. 2026-09-05 22:03 UTCEG score recompute
  11. 2026-09-05 22:03 UTCGHSA enrichment
  12. 2026-09-04 21:03 UTCEG score recompute
  13. 2026-09-04 21:03 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-03 20:00 UTCGHSA enrichment
  16. 2026-09-02 19:00 UTCEG score recompute
  17. 2026-09-02 18:59 UTCGHSA enrichment
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 20:20 UTCEG score recompute
  20. 2026-09-01 19:45 UTCEG score recompute
  21. 2026-09-01 19:25 UTCEG score recompute
  22. 2026-09-01 19:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78605?
CVE-2026-78605 is a medium vulnerability published on September 1, 2026. Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') (CWE-444) in Elasticsearch can lead to information disclosure via HTTP Request Smuggling (CAPEC-33). Under specific proxy deployment configurations, a network attacker could obtain confidential responses intended for other…
When was CVE-2026-78605 disclosed?
CVE-2026-78605 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78605 actively exploited?
CVE-2026-78605 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 88.3% of all scored CVEs.
What is the CVSS score of CVE-2026-78605?
CVE-2026-78605 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-78605?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78605, 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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