{"id":"CVE-2026-71851","sourceIdentifier":"security-advisories@github.com","published":"2026-08-07T19:18:54.390","lastModified":"2026-10-24T15:10:00.190","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"crypto-js is a JavaScript library of crypto standards. Versions of crypto-js prior to 4.0.0 generate randomness in CryptoJS.lib.WordArray.random() using a custom variation of the Multiply-With-Carry pseudorandom number generator, seeded from Math.random(), instead of a cryptographically secure source. This generator was introduced in version 3.1.2-4 and remained present in nearly every 3.x release. Nominal requests for 128 or 256 bits of entropy through this function produce effective search spaces of approximately 2 to the 39th and 2 to the 47th possibilities, small enough to enumerate on commodity hardware. Downstream wallet applications that used CryptoJS.lib.WordArray.random() as the entropy source for BIP39 recovery phrases are affected, and an attacker who enumerates the reduced output space can recover the resulting private keys and control the associated funds. This issue is fixed in version 4.0.0."},{"lang":"es","value":"crypto-js es una biblioteca JavaScript de estándares criptográficos. Las versiones de crypto-js anteriores a la 4.0.0 generan aleatoriedad en CryptoJS.lib.WordArray.random() utilizando una variación personalizada del generador de números pseudoaleatorios Multiply-With-Carry, sembrado a partir de Math.random(), en lugar de una fuente criptográficamente segura. Este generador fue introducido en la versión 3.1.2-4 y permaneció presente en casi todas las versiones 3.x. Las solicitudes nominales de 128 o 256 bits de entropía a través de esta función producen espacios de búsqueda efectivos de aproximadamente 2 elevado a la 39 y 2 elevado a la 47 posibilidades, lo suficientemente pequeños como para ser enumerados en hardware comercial. Las aplicaciones de monedero descendentes que utilizaron CryptoJS.lib.WordArray.random() como fuente de entropía para frases de recuperación BIP39 se ven afectadas, y un atacante que enumere el espacio de salida reducido puede recuperar las claves privadas resultantes y controlar los fondos asociados. Este problema está solucionado en la versión 4.0.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"brix","product":"crypto-js","versions":[{"version":"< 4.0.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":9.0,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":6.0}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-08T03:05:26.687602Z","id":"CVE-2026-71851","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-331"},{"lang":"en","value":"CWE-334"},{"lang":"en","value":"CWE-338"}]}],"references":[{"url":"https://github.com/brix/crypto-js/commit/b405ff597fb3ac76a7bdfbc72dca10ba1079b1d5","source":"security-advisories@github.com"},{"url":"https://github.com/brix/crypto-js/security/advisories/GHSA-rg76-677x-56q9","source":"security-advisories@github.com"},{"url":"https://www.coinspect.com/blog/ill-bloom-investigation","source":"security-advisories@github.com"},{"url":"https://github.com/brix/crypto-js/security/advisories/GHSA-rg76-677x-56q9","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}