{"id":"CVE-2026-14257","sourceIdentifier":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","published":"2026-07-23T14:17:00.250","lastModified":"2026-10-24T13:10:00.147","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"brace-expansion hasta la 5.0.7 es vulnerable a denegación de servicio por agotamiento de memoria. La función expand() limita el número de resultados con una opción max (predeterminado 100.000) pero no limita la longitud de cada cadena de resultado. Al encadenar múltiples grupos de llaves, un atacante mantiene el recuento de resultados por debajo del límite mientras hace que cada resultado sea progresivamente más largo, por lo que la memoria total escala tanto con el recuento como con la longitud de la cadena hasta que el proceso alcanza un error fatal e inatrapable de falta de memoria. Aproximadamente 7,5 KB de entrada (’{a,b}’.repeat(1500)) bloquea un proceso predeterminado de Node.js. Cualquier aplicación que pase cadenas influenciadas por el atacante a brace-expansion.expand() - directa o transitivamente a través de patrones de llaves de minimatch / glob - puede ser bloqueada por una pequeña solicitud. Solucionado en la 5.0.8 al añadir una opción maxLength (predeterminado 4.000.000) que limita la salida acumulada y los arrays intermedios."}],"affected":[{"source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","affectedData":[{"vendor":"juliangruber","product":"brace-expansion","defaultStatus":"unaffected","collectionURL":"https://www.npmjs.com/package/brace-expansion","packageName":"brace-expansion","platforms":["Linux","macOS","Windows"],"versions":[{"version":"0","lessThanOrEqual":"5.0.7","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-23T14:44:31.208878Z","id":"CVE-2026-14257","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","type":"Secondary","description":[{"lang":"en","value":"CWE-400"},{"lang":"en","value":"CWE-770"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:juliangruber:brace-expansion:*:*:*:*:*:node.js:*:*","versionEndExcluding":"1.1.17","matchCriteriaId":"6A3C9190-9761-4391-A6B5-9C56EFDDB63C"},{"vulnerable":true,"criteria":"cpe:2.3:a:juliangruber:brace-expansion:*:*:*:*:*:node.js:*:*","versionStartIncluding":"2.0.0","versionEndExcluding":"2.1.3","matchCriteriaId":"E7CB6D5D-C7B5-4E8B-8204-55A9E5D923A9"},{"vulnerable":true,"criteria":"cpe:2.3:a:juliangruber:brace-expansion:*:*:*:*:*:node.js:*:*","versionStartIncluding":"3.0.0","versionEndExcluding":"3.0.3","matchCriteriaId":"1CC7869F-C0AA-4AB5-9F7D-F0A640ACADEC"},{"vulnerable":true,"criteria":"cpe:2.3:a:juliangruber:brace-expansion:*:*:*:*:*:node.js:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"5.0.8","matchCriteriaId":"8BEEAFEA-44B5-4B1B-A25A-2224F3C9F94C"}]}]}],"references":[{"url":"https://github.com/juliangruber/brace-expansion","source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","tags":["Product"]},{"url":"https://github.com/juliangruber/brace-expansion/commit/a1bd33999ea75262c4749fff3bbb0d1372bd07b5","source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","tags":["Patch"]},{"url":"https://www.npmjs.com/package/brace-expansion","source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","tags":["Product"]}]}