CVE-2026-2739

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["https://www.cve.org/CVERecord?id=CVE-2026-2739\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2739\nhttps://gist.github.com/Kr0emer/02370d18328c28b5dd7f9ac880d22a91\nhttps://github.com/indutny/bn.js/commit/33df26b5771e824f303a79ec6407409376baa64b\nhttps://github.com/indutny/bn.js/issues/186\nhttps://github.com/indutny/bn.js/issues/316\nhttps://github.com/indutny/bn.js/pull/317\nhttps://security.snyk.io/vuln/SNYK-JS-BNJS-15274301"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.2.3)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}]}, "original": {"product": "bn.js", "source": "cna", "vendor": "n/a"}, "product": "bn.js", "vendor": "indutny"}], "analysis": {"en": {"generated_at": "2026-04-18T11:34:44.881616+00:00", "value": {"mitigation_remediation": ["Upgrade bn.js to version\u00a05.2.3 or newer to eliminate the flaw.", "Audit application code to ensure that maskn(0) is never called, especially in paths that process untrusted input.", "Add runtime checks or sandboxing that prevents execution of untrusted JavaScript so that maskn(0) cannot be invoked by an attacker."], "summary": {"action": "Patch Immediately", "impact": "Denial of Service via infinite loop in bn.js"}, "threat_synthesis": {"affected_systems": "All JavaScript runtimes that include the open\u2011source bn.js library prior to version 5.2.3, for example Node.js applications that depend on indutny/bn.js for large\u2011integer arithmetic.", "description_and_impact": "Calling maskn(0) on a bn.js instance corrupts its internal big\u2011integer representation, causing several methods such as toString() and divmod() to enter an infinite loop that freezes the JavaScript process. This is a classic resource exhaustion flaw (CWE\u2011835) that results in a denial of service.", "risk_and_exploitability": "The CVSS score of 6.9 indicates moderate severity, while the EPSS score of less than 1\u202f% suggests that real\u2011world exploitation is currently unlikely. The vulnerability is not listed in CISA KEV. Exploitation requires attacker\u2011controlled code to invoke maskn(0), implying a local or supply\u2011chain risk rather than a direct network\u2011exploitable vector."}}}}, "created": "2026-02-20T09:52:40.471264+00:00", "updated": "2026-04-18T11:45:44.586965+00:00", "vendors": ["indutny", "indutny$PRODUCT$bn.js"]}