CVE-2026-49440

{"id": "CVE-2026-49440", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49440", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-25T03:55:49.551538Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.2}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "denoland", "product": "deno", "versions": [{"status": "affected", "version": "< 2.8.1"}]}]}], "published": "2026-06-23T18:18:03.563", "references": [{"url": "https://github.com/denoland/deno/pull/34391", "tags": ["Issue Tracking"], "source": "security-advisories@github.com"}, {"url": "https://github.com/denoland/deno/security/advisories/GHSA-9xg4-qhm4-g43w", "tags": ["Third Party Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-325"}]}], "descriptions": [{"lang": "en", "value": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, node:crypto.checkPrime(candidate[, options][, callback]) and crypto.checkPrimeSync(candidate[, options]) ran no Miller-Rabin rounds at all when the caller left options.checks at its default of 0. In that mode, the only test applied to the candidate was trial division by the primes up to 17,863. Any composite whose smallest prime factor exceeds that bound \u2014 for example the product of two primes just above it, such as 17,881 \u00d7 17,891 \u2014 was reported as true (\"probably prime\"). The same divergence affected the lower-level op_node_check_prime / op_node_check_prime_bytes paths that the polyfill calls into. This vulnerability is fixed in 2.8.1."}, {"lang": "es", "value": "Deno es un entorno de ejecuci\u00f3n de JavaScript, TypeScript y WebAssembly. Antes de 2.8.1, node:crypto.checkPrime(candidate[, options][, callback]) y crypto.checkPrimeSync(candidate[, options]) no realizaban ninguna ronda de Miller-Rabin en absoluto cuando el llamador dejaba options.checks en su valor predeterminado de 0. En ese modo, la \u00fanica prueba aplicada al candidato era la divisi\u00f3n por tentativa por los n\u00fameros primos hasta 17.863. Cualquier n\u00famero compuesto cuyo factor primo m\u00e1s peque\u00f1o excediera ese l\u00edmite - por ejemplo, el producto de dos n\u00fameros primos justo por encima de \u00e9l, como 17.881 \u00d7 17.891 - se reportaba como verdadero (\u2019probablemente primo\u2019). La misma divergencia afectaba a las rutas de bajo nivel op_node_check_prime / op_node_check_prime_bytes que el polyfill invoca. Esta vulnerabilidad est\u00e1 corregida en 2.8.1."}], "lastModified": "2026-10-25T23:10:00.167", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "91F453C2-277C-4350-8234-700B47587E97", "versionEndExcluding": "2.8.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}