CVE-2026-102277 Details
Description
The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.21, 2.1.7, 3.0.9, and 5.0.12, the expand function handles untrusted {a},b}-shaped patterns with many trailing closing braces by restarting its scan once for each trailing closing brace. The successive full-input rescans with linear working-string growth cause quadratic CPU time and memory pressure that can block the Node.js event loop. The process eventually recovers, making the impact a recoverable CPU denial of service. This issue is fixed in versions 1.1.21, 2.1.7, 3.0.9, and 5.0.12.
A denial-of-service vulnerability has been identified in the brace-expansion library, affecting versions prior to 1.1.21, 2.1.7, 3.0.9, and 5.0.12. The issue arises in the expand function, which processes untrusted patterns resembling '{a},b}' with multiple trailing closing braces. This processing creates a quadratic increase in CPU usage and memory consumption, blocking the Node.js event loop. Although the event loop eventually recovers, this vulnerability can still degrade application performance significantly.
Users can upgrade to brace-expansion versions 1.1.21, 2.1.7, 3.0.9, or 5.0.12 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 28, 2026CISA-ADP
Assessed Sep 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/juliangruber/brace-expansion/commit/33a5ef17b8d800bbfa8c52b14c39043b6aac1a96 | [email protected] | Source CodeTechnical AnalysisVendor |
| https://github.com/juliangruber/brace-expansion/commit/bdff773f98e5988616b7039cc9b508df5d640b22 | [email protected] | Source CodeVendor |
| https://github.com/juliangruber/brace-expansion/commit/c55e67d8d8b1c56a2474afff15c2891166b2d364 | [email protected] | Source CodeTechnical AnalysisVendor |
| https://github.com/juliangruber/brace-expansion/commit/ffdfa3e3806bed17c0874b8f1439b084de354a7e | [email protected] | Source CodeVendor |
| https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-q2hr-2g5m-vwhr | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-407 | Inefficient Algorithmic Complexity | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| brace-expansion | < 1.1.21 (semver) >= 2.0.0, < 2.1.7 (semver) >= 3.0.0, < 3.0.9 (semver) >= 4.0.0, < 5.0.12 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 29, 2026 | CVE Modified | CISA-ADP |
| Sep 28, 2026 | New CVE Received | [email protected] |