CVE-2026-78605

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in Elasticsearch Leading to Information Disclosure

State: Published
Severity: 5.9 Medium
Published: Sep 1, 2026
Updated: Sep 1, 2026
Reserved: Aug 24, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	elastic

Weaknesses

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Affected Products

Product	Versions
ElasticsearchElastic	8.18.0 through 8.19.19Affected 9.0.0 through 9.4.4Affected 9.5.0Affected

References

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

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