{"cve":"CVE-2026-4603","nvd":{"published":"2026-03-23T06:16:22.233","modified":"2026-06-22T03:18:31.867","status":"Analyzed","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.","cvss_v4":{"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","score":2.0},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","score":5.3},"cwes":["CWE-369"],"references":["https://gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3","https://github.com/kjur/jsrsasign/commit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f","https://github.com/kjur/jsrsasign/pull/649","https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176"],"products":["kjur:jsrsasign"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4603","score":0.00102,"percentile":0.00902,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-464q-cqxq-xhgr","url":"https://osv.dev/vulnerability/GHSA-464q-cqxq-xhgr","summary":"jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output in RSA Operations","modified":"2026-03-30T19:56:21.371329Z","packages":[{"ecosystem":"npm","name":"jsrsasign","purl":"pkg:npm/jsrsasign","ranges":["<11.1.1"],"fixed":["11.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}