What’s Vulnerable › Vulnerabilities
CVE-2026-78605: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in Elasticsearch Leading to Information Disclosure
- Severity: medium (CVSS 5.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-01 · updated 2026-09-02
- Weakness: CWE-444
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 products
- Elasticsearch: from 8.18.0 before 8.19.20; from 9.0.0 before 9.4.5; 9.5.0 — fixed in 8.19.20, 9.4.5
How to fix
Upgrade to a fixed version: Elasticsearch 8.19.20, 9.4.5. Check the vendor advisory for mitigations.
References
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