brace-expansion: Quadratic-time expansion of the `{a},b}` rewrite causes CPU denial of service
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.
CVE-2026-102277
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-102277
brace-expansion
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "juliangruber",
"product": "brace-expansion",
"versions": [
{
"status": "affected",
"version": ">= 4.0.0, < 5.0.12"
},
{
"status": "affected",
"version": ">= 3.0.0, < 3.0.9"
},
{
"status": "affected",
"version": ">= 2.0.0, < 2.1.7"
},
{
"status": "affected",
"version": "< 1.1.21"
}
]
}
]- Related CVEs
- CVE-2026-102277
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #3973 · Revision 1
- Added to Heist Feed
- Publisher date