Vulnerability in Elastic Elasticsearch
CVE-2026-78605
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.
Vulnerability class: HTTP Request Smuggling
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Elastic Elasticsearch — versions 9.5.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-78605?
- CVE-2026-78605 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.9/10. Published 2026-09-01.
- How severe is CVE-2026-78605?
- Medium severity. CVSS v3 base score is 5.9 out of 10.