Node.js process crash via unbounded AST recursion
Published Sep 18, 2026 · Updated Sep 18, 2026
Uncontrolled recursion in Micromatch Braces 3.0.3 and earlier allows remote attackers to crash a Node.js process via nested patterns. The compile and expand AST walkers recurse once per nested brace without a depth guard, so inputs below the 10,000-character cap exhaust the call stack. Exploitation requires a consuming application to pass attacker-controlled brace patterns and leave the resulting RangeError uncaught; the consequence is process termination.
Summary
What happened
Uncontrolled recursion in Micromatch Braces 3.0.3 and earlier allows remote attackers to crash a Node.js process via nested patterns. The compile and expand AST walkers recurse once per nested brace without a depth guard, so inputs below the 10,000-character cap exhaust the call stack. Exploitation requires a consuming application to pass attacker-controlled brace patterns and leave the resulting RangeError uncaught; the consequence is process termination.
The record
- CVE
- CVE-2026-93687
- Published
- Sep 18, 2026
- Updated
- Sep 18, 2026
- Vendor
- Micromatch
- Product
- Braces
- Classifications
- CWE-674, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 18, 2026CVE publishedPublication date reported by the CVE source.
- Sep 18, 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?
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- Affected versionversion=0 <=3.0.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
- Deeply nested brace-pattern stack-overflow reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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