{"cve":"CVE-2026-4602","nvd":{"published":"2026-03-23T06:16:22.070","modified":"2026-09-10T13:20:22.877","status":"Modified","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P","score":7.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-681"],"references":["https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5","https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195","https://github.com/kjur/jsrsasign/pull/650","https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812274","https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175"],"products":["kjur:jsrsasign"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4602","score":0.00499,"percentile":0.42749,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8qwj-4jxw-m8jw","url":"https://osv.dev/vulnerability/GHSA-8qwj-4jxw-m8jw","summary":"jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass","modified":"2026-07-21T14:00:32.751983961Z","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."]}