CVE-2026-78605
Medium
Description
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Elasticsearch
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-444CWE-444
How to fix
Update
- elastic elasticsearch8.19.20, 9.4.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| elastic elasticsearch | 8.18.0 ≤ v < 8.19.20, 9.0.0 ≤ v < 9.4.5, 9.5.0 | 8.19.20, 9.4.5 |
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