Bug 2566065 (CVE-2026-115710)

Summary: CVE-2026-115710 elasticsearch: elasticsearch: Information disclosure via improper query cache sharing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Elasticsearch. For certain query types, cached search results are incorrectly shared between users subject to field-level security restrictions and unrestricted users. An authenticated attacker with restricted permissions can exploit this flaw by submitting crafted search requests to deduce sensitive document details they are not authorized to view. Additionally, this flaw can cause privileged users to receive incomplete search results if matching queries were recently executed.
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Description OSIDB Bzimport 2026-11-03 18:12:48 UTC 
Use of Cache Containing Sensitive Information (CWE-524) in Elasticsearch can lead to information disclosure and incorrect search results via specially crafted search requests. For some query types, Elasticsearch can share cached query results between users who have field-level security restrictions and users who do not. A user restricted by field-level security can learn which documents match a value in a field that they cannot read. A restricted user can also cause users with full access to receive incomplete search results. Disclosure is only possible when a user with full access ran the same query on the same shard recently.