Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-102408

Inefficient Regular Expression Complexity (CWE-1333) in Elasticsearch can lead to denial of service via Regular Expression Exponential Blowup (CAPEC-492). The ES|QL CHUNK function's recursive chunking strategy accepts a list of user-supplied regular expressions used as text-splitting separators, without validating their computational complexity or bounding their execution time. An authenticated user with read access to any text-based index can submit a specially crafted regular expression that triggers catastrophic backtracking, consuming excessive CPU on Elasticsearch worker threads and degrading query throughput for other tenants on the affected node. The cluster does not crash as a result of this issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 25.5%
CVSS Severity
CVSS v3 Score 4.3
Products affected by CVE-2026-102408


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