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    CVE-2026-72638

    Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). An authenticated user holding only low-privileged index creation permissions can submit a single request containing a specially crafted, malformed custom analysis definition that is resolved recursively without a cycle or depth check, exhausting the thread stack and terminating the affected node.

    Published:Aug 13, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 13, 2026
    EPSS Score:0.0029
    CVSS Score:6.5

    Affected Products

    Vendor
    Elastic
    Product
    Elasticsearch

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-674 Uncontrolled Recursion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads

    Related CVEs

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    CVE-2026-72649 (CVSS 8.8) — Deserialization of Untrusted Data (CWE-502) in the Elasticsearch machine learning component can lead to remote…
    CVE-2026-56143 (CVSS 4.9) — Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of servic…
    CVE-2026-72636 (CVSS 6.5) — Uncontrolled Recursion (CWE-674) in the Elasticsearch wildcard matching helper can lead to a denial of service…
    CVE-2026-72642 (CVSS 8.8) — The native inference process that Elasticsearch uses to evaluate uploaded machine learning models accepts a mo…
    CVE-2026-72639 (CVSS 6.5) — Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting optio…
    CVE-2026-72647 (CVSS 6.5) — Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Serialized Data with Neste…
    CVE-2026-72645 (CVSS 6.5) — Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Exces…
    CVE-2026-72656 (CVSS 6.5) — Memory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High