Answer in brief
CVE-2026-102277 records a Medium severity (CVSS 5.3) vulnerability in brace-expansion: Quadratic-time expansion of the `{a},b}` rewrite causes CPU denial of service. The current sources do not mark it as known exploited. The current feed maps juliangruber/brace-expansion (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps juliangruber/brace-expansion (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| juliangruber/brace-expansiongeneric | >=4.0.0 <5.0.12 || >=3.0.0 <3.0.9 || >=2.0.0 <2.1.7 || <1.1.21 | 1.1.21, 5.0.12, 3.0.9, 2.1.7 |
Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.