{"id":"CVE-2026-4603","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-4603","generatedAt":"2026-10-28T01:10:54.718Z","title":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js.","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.","published":"2026-03-23T06:16:22.000Z","lastModified":"2026-06-22T03:18:32.000Z","status":"Analyzed","sourceIdentifier":"report@snyk.io","cvss":{"version":"4.0","score":2,"severity":"LOW","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-369"],"affected":["kjur/jsrsasign"],"epss":{"score":0.00102,"percentile":0.00907,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","tags":["Exploit","Mitigation","Third Party Advisory"],"source":"report@snyk.io"},{"url":"https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","tags":["Patch"],"source":"report@snyk.io"},{"url":"https://github.com/kjur/jsrsasign/pull/649","tags":["Issue Tracking"],"source":"report@snyk.io"},{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176","tags":["Third Party Advisory"],"source":"report@snyk.io"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-4603","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}