# CVE-2026-93687: braces stack overflow in recursive AST walkers

Source: https://junglewise.ai/threats/cve-2026-93687-braces-through-3-0-3-contains-a-stack-overflow-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93687 · Severity: high · CVSS 7.5 · Published 2026-09-18

braces is a Node.js library that expands brace patterns, commonly used for file path matching. A stack overflow vulnerability allows attackers to crash Node.js processes by supplying deeply nested brace patterns that exhaust the call stack, causing denial of service to applications that depend on this library.

Technologies: [braces (npm)](https://junglewise.ai/threats/technologies/braces). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-93687 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93687 being exploited in the wild.

**How severe is CVE-2026-93687?** High severity, with a CVSS score of 7.5, published 18 September 2026.

**Which products and versions are affected?** Micromatch Braces through 3.0.3; braces (npm) <= 3.0.3, SEMVER:introduced=0,last_affected=3.0.3.

**Is there a fix for CVE-2026-93687?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-93687 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-93687?** Check whether you run Micromatch Braces or braces (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The recursive AST walkers in braces lack depth guards, allowing attackers to craft deeply nested brace patterns that trigger unbounded recursion. An attacker can supply malicious input under character limits that still causes stack exhaustion, resulting in an uncaught RangeError that terminates the Node.js process. This is a denial-of-service vector affecting any application using the library to parse untrusted brace patterns.

## Affected products

- micromatch braces through 3.0.3

## Identifiers

- CVE-2026-93687
- GHSA-vfj7-8cjw-p6xm

## Timeline

- 2026-09-18: disclosed

## References

- [https://www.npmjs.com/package/braces](https://www.npmjs.com/package/braces)
- [https://github.com/micromatch/braces](https://github.com/micromatch/braces)

## Related threats

- [braces uncontrolled resource consumption](https://junglewise.ai/threats/cve-2024-4068-braces-uncontrolled-resource-consumption)
- [braces regular expression denial of service](https://junglewise.ai/threats/cve-2018-1109-braces-regular-expression-denial-of-service)
- [braces regular expression denial of service](https://junglewise.ai/threats/braces-regular-expression-denial-of-service-b7ef8e21)