brace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion. The expand() function limits the number of results with a max option (default 100,000) but does not bound the length of each result string. By chaining multiple brace groups, an attacker keeps the result count under the limit while making each result progressively longer, so total memory scales with both count and string length until the process hits a fatal, uncatchable out-of-memory error. About 7.5 KB of input ('{a,b}'.repeat(1500)) crashes a default Node.js process. Any application that passes attacker-influenced strings to brace-expansion.expand() - directly or transitively via minimatch / glob brace patterns - can be crashed by a small request. Fixed in 5.0.8 by adding a maxLength option (default 4,000,000) that bounds accumulated output and intermediate arrays.
CVE-2026-14257
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EG Risk
- 49(Track)EG Risk 49/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 26%
- KEV
- Not listed
Published
July 23, 2026
Last Modified
July 23, 2026
Advisory Details (2)
Auto-updated Jul 23, 2026commit a1bd33999ea7 (juliangruber/brace-expansion)
Fix landed in juliangruber/brace-expansion commit a1bd33999ea7 — awaiting tagged release
https://github.com/juliangruber/brace-expansion/commit/a1bd33999ea75262c4749fff3bbb0d1372bd07b5GitHub - juliangruber/brace-expansion: Brace expansion, as known from sh/bash, in JavaScript · GitHub
https://github.com/juliangruber/brace-expansionVendor Advisories for CVE-2026-14257(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 12× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-29 02:30 UTCEG score recompute
- 2026-07-28 15:36 UTCEPSS rescore
- 2026-07-27 15:05 UTCEG score recompute
- 2026-07-27 14:13 UTCEPSS rescore
- 2026-07-26 14:56 UTCEG score recompute
- 2026-07-26 14:54 UTCEPSS rescore
- 2026-07-26 14:54 UTCEPSS rescore
- 2026-07-26 03:09 UTCEG score recompute
- 2026-07-25 14:17 UTCEPSS rescore
- 2026-07-24 14:17 UTCEPSS rescore
- 2026-07-23 13:25 UTCEG score recompute
- 2026-07-23 13:24 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-14257?
When was CVE-2026-14257 disclosed?
Is CVE-2026-14257 actively exploited?
What is the CVSS score of CVE-2026-14257?
How do I remediate CVE-2026-14257?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-14257
Is Your Infrastructure Affected by CVE-2026-14257?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.