{"id":"CVE-2026-4603","state":"PUBLISHED","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","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.","publishedAt":"2026-03-23T05:00:14.060Z","updatedAt":"2026-03-23T14:42:16.345Z","severity":{"score":5.1,"label":"Medium","version":"4.0","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","source":"snyk"},"assigner":"snyk","products":["n/a jsrsasign"],"affected":[{"vendor":"n/a","product":"jsrsasign","versions":[{"version":"0","status":"affected","lessThan":"11.1.1","versionType":"semver"}]}],"references":["https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176","https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","https://github.com/kjur/jsrsasign/pull/649"],"weaknesses":["CWE-369"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/4xxx/CVE-2026-4603.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4603","state":"PUBLISHED","datePublished":"2026-03-23T05:00:14.060Z","dateUpdated":"2026-03-23T14:42:16.345Z","assignerShortName":"snyk","assignerOrgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730","dateReserved":"2026-03-22T16:26:19.818Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"jsrsasign","versions":[{"version":"0","status":"affected","lessThan":"11.1.1","versionType":"semver"}]}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176"},{"url":"https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3"},{"url":"https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f"},{"url":"https://github.com/kjur/jsrsasign/pull/649"}],"metrics":[{"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"LOW","exploitCodeMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":5.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P"},"cvssV4_0":{"version":"4.0","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-369","description":"Division by zero","lang":"en"}]}],"providerMetadata":{"shortName":"snyk","orgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730","dateUpdated":"2026-03-23T05:00:14.060Z"},"credits":[{"value":"Kr0emer","lang":"en"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-23T14:42:08.541897Z","id":"CVE-2026-4603","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-23T14:42:16.345Z"}}]}}}