CVE-2026-78605 Information disclosure in Elasticsearch
Network attackers can exploit HTTP request smuggling in Elasticsearch to access confidential responses from other authenticated users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78605?
CVE-2026-78605 is a medium-severity vulnerability in Elastic Elasticsearch, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-444
Which versions are affected by CVE-2026-78605?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 8.18.0 | 8.19.20, 9.4.5, 9.5.1 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-78605?
Upgrade elasticsearch to a fixed version for your release line: 8.19.20, 9.4.5 or 9.5.1.
Is CVE-2026-78605 being exploited?
There is no known exploitation of CVE-2026-78605 in the wild and no public exploit code.
Other vulnerabilities in Elastic Elasticsearch
- CVE-2015-1427 Elasticsearch Groovy Scripting Engine Remote Code Execution
- CVE-2014-3120 Elasticsearch Remote Code Execution
- CVE-2015-5377 Code injection in n/a
- CVE-2026-72649 Deserialization of Untrusted Data in Elasticsearch Leading to Remote Code Execution
- CVE-2026-72642 Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference Process
Sources
Also known as BIT-elasticsearch-2026-78605, CLEANSTART-2026-LC56406, CLEANSTART-2026-XT16211, GHSA-mfgq-fwjq-xx5p, MINI-2hxw-pj7q-wr3m, MINI-3ff7-jxhv-hjcg and 16 more.