CVE-2026-102408— Inefficient Regular Expression Complexity in Elasticsearch Leading to Denial of Service
Quick assessment
Affected
Elastic Elasticsearch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Elasticsearch 中存在低效正则表达式复杂度漏洞（CWE-1333），可能导致通过正则表达式指数级膨胀（CAPEC-492）引发拒绝服务（DoS）攻击。ES
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1499 · Endpoint Denial of ServiceAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Elastic | Elasticsearch | 8.19.0≤ 8.19.21 |
affected |
9.1.0≤ 9.3.8 |
affected | ||
9.4.0≤ 9.4.7 |
affected | ||
9.5.0≤ 9.5.4 |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-102408
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Inefficient Regular Expression Complexity in Elasticsearch Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Elastic | Elasticsearch | 8.19.0 ~ 8.19.21 | - |
|
II. Public POCs for CVE-2026-102408
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-102408
请登录查看更多情报信息。
Other References for CVE-2026-102408 (1)
Same Patch Batch · Elastic · 2026-10-06 · 14 CVEs total
| CVE-2026-102406 | 8.8 HIGH | Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Tenant Data In |
| CVE-2026-103007 | 7.2 HIGH | Incorrect Authorization in Elasticsearch Leading to Privilege Escalation |
| CVE-2026-103009 | 7.1 HIGH | Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information D |
| CVE-2026-102412 | 6.5 MEDIUM | Incorrect Authorization in Kibana Leading to Sensitive Information Disclosure |
| CVE-2026-102409 | 6.5 MEDIUM | Uncontrolled Recursion in Elasticsearch Leading to Denial of Service |
| CVE-2026-102411 | 6.5 MEDIUM | Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of |
| CVE-2026-102404 | 6.5 MEDIUM | Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service |
| CVE-2026-103008 | 6.5 MEDIUM | Uncontrolled Recursion in Elasticsearch Leading to Denial of Service |
| CVE-2026-103005 | 6.5 MEDIUM | Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service |
| CVE-2026-103006 | 6.5 MEDIUM | Uncontrolled Recursion in Elasticsearch Leading to Denial of Service |
| CVE-2026-102413 | 6.2 MEDIUM | Uncaught Exception in Elastic Endpoint Leading to Denial of Service |
| CVE-2026-102407 | 5.4 MEDIUM | Incorrect Authorization in Elasticsearch Leading to Unauthorized Data Stream Modification |
| CVE-2026-102410 | 4.3 MEDIUM | Missing Authorization in Kibana Leading to Information Disclosure |
IV. Related Vulnerabilities
Same product: Elasticsearch
-
CVE-2026-103009
Authorization Bypass Through User-Controlled Key in Elastics -
CVE-2026-103008
Uncontrolled Recursion in Elasticsearch Leading to Denial of -
CVE-2026-103007
Incorrect Authorization in Elasticsearch Leading to Privileg -
CVE-2026-103006
Uncontrolled Recursion in Elasticsearch Leading to Denial of -
CVE-2026-103005
Memory Allocation with Excessive Size Value in Elasticsearch
Same vendor: Elastic
-
CVE-2026-103009
Authorization Bypass Through User-Controlled Key in Elastics -
CVE-2026-103008
Uncontrolled Recursion in Elasticsearch Leading to Denial of -
CVE-2026-103007
Incorrect Authorization in Elasticsearch Leading to Privileg -
CVE-2026-103006
Uncontrolled Recursion in Elasticsearch Leading to Denial of -
CVE-2026-103005
Memory Allocation with Excessive Size Value in Elasticsearch
Same weakness: CWE-1333
-
CVE-2026-106454
Twisted: IMAP wildcardToRegexp() ReDoS -
CVE-2026-106104
Quasar Framework: Super-linear regex backtracking on User-Ag -
CVE-2026-105646
Ghost: Regular Expression Denial of Service in Content Impor -
CVE-2026-105645
Ghost: Regular Expression Denial of Service in External Medi -
CVE-2026-105219
Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser
V. Comments for CVE-2026-102408
No comments yet