Server hang via bypassable regex safety blocklist
Published Jun 2, 2026 · Updated Jun 2, 2026
Regular expression denial of service in Code Index MCP 2.14.0 and earlier allows remote authenticated users to hang the server. BasicSearchStrategy compiles a user-controlled pattern with Python re and applies it line by line after a three-pattern blocklist misses other nested quantifiers. Exploitation requires regex mode, the basic fallback without a native search tool, and matching file content; catastrophic backtracking exhausts CPU and blocks subsequent MCP calls until the process is killed.
Summary
What happened
Regular expression denial of service in Code Index MCP 2.14.0 and earlier allows remote authenticated users to hang the server. BasicSearchStrategy compiles a user-controlled pattern with Python re and applies it line by line after a three-pattern blocklist misses other nested quantifiers. Exploitation requires regex mode, the basic fallback without a native search tool, and matching file content; catastrophic backtracking exhausts CPU and blocks subsequent MCP calls until the process is killed.
The record
- CVE
- CVE-2026-10692
- Published
- Jun 2, 2026
- Updated
- Jun 2, 2026
- Vendor
- johnhuang316
- Product
- Code Index MCP
- Classifications
- CWE-400, CWE-1333, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 2, 2026CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.0
- Affected versionversion=2.1
- Affected versionversion=2.10
- Affected versionversion=2.11
- Affected versionversion=2.12
- Affected versionversion=2.13
- Affected versionversion=2.14.0
- Affected versionversion=2.2
- Affected versionversion=2.3
- Affected versionversion=2.4
- Affected versionversion=2.5
- Affected versionversion=2.6
- Affected versionversion=2.7
- Affected versionversion=2.8
- Affected versionversion=2.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Issue 84 ReDoS proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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