CVE-2026-78605: Elastic Elasticsearch

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Elastic Elasticsearch: from 8.18.0, before 8.19.20 (fixed in 8.19.20); from 9.0.0, before 9.4.5 (fixed in 9.4.5); version 9.5.0 only

Published 2026-09-01. Last modified 2026-09-02.