{"schemaVersion":3,"id":"CVE-2026-4603","aliases":["GHSA-464q-cqxq-xhgr"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-03-23T05:00:14.060Z","modified":"2026-03-23T14:42:16.345Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Npm","score":5.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","score":5.9,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":6.4,"impact":5.7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00114,"percentile":0.01432,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.013999999999999993,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.001},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00114,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00114,"percentile":0.01432}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0011,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00114,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00114,"percentile":0.01432}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_KR0EMER_5366B7364C4FBF7E754BC377F321E9F3","name":"5366B7364C4Fbf7E754Bc377F321E9F3","source":"github","url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-369","name":"Divide By Zero","description":"The product divides a value by zero.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/369.html"}],"affected":[{"vendor":"kjur","product":"jsrsasign","name":"jsrsasign","label":"jsrsasign","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 11.1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 11.1.1","eol":null,"hubHref":"/vendor/kjur/jsrsasign"},{"vendor":"Npm","product":"jsrsasign","name":"jsrsasign","label":"jsrsasign","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/jsrsasign","purlType":"npm","versions":[{"text":"< 11.1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 11.1.1","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176","label":"security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176","hostname":"security.snyk.io","tags":["WEB","Third Party Advisory"]},{"url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","label":"gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","hostname":"gist.github.com","tags":["WEB","Exploit","Mitigation","Third Party Advisory"]},{"url":"https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","label":"github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","hostname":"github.com","tags":["WEB","Patch"]},{"url":"https://github.com/kjur/jsrsasign/pull/649","label":"github.com/kjur/jsrsasign/pull/649","hostname":"github.com","tags":["WEB","Issue Tracking"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4603","label":"nvd.nist.gov/vuln/detail/CVE-2026-4603","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/kjur/jsrsasign","label":"github.com/kjur/jsrsasign","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-03-23T05:00:14.060Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-03-23T14:42:16.345Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T21:36:44.443Z","stale":false,"partial":false}}