CVE-2026-78605

Published: Sep 1, 2026Modified: Sep 2, 2026

5.9

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitability: 2.2 / Impact: 3.6

Source: security@elastic.co (Secondary)

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.

Affected (3)

Products: Elastic: Elasticsearch

1 product

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Elastic Elasticsearch	From 8.18.0 to 8.19.20
Elastic Elasticsearch	From 9.0.0 to 9.4.5
Elastic Elasticsearch	Version 9.5.0

Related CWEs

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (1)

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

Source: security@elastic.co

Vendor Advisory

Timeline

No history available yet.