{"id":"CVE-2026-4602","aliases":["EUVD-2026-14379","GHSA-8qwj-4jxw-m8jw"],"status":"published","title":"jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass","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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0051,"percentile":0.43769,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-681"],"published":"2026-03-23T05:00:10Z","modified":"2026-10-28T02:30:40Z","fixes":[{"ecosystem":"npm","package":"jsrsasign","fixed_in":["11.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"jsrsasign","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.1.1"}]}]},{"source":"osv","ecosystem":"npm","package":"jsrsasign","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"11.1.1"}]}]}],"products":[{"vendor":"kjur","product":"jsrsasign"},{"vendor":"red hat","product":"migration toolkit for virtualization 2.1"},{"vendor":"red hat","product":"migration toolkit for virtualization 2.9"},{"vendor":"red hat","product":"red hat quay 3.10"},{"vendor":"red hat","product":"red hat quay 3.12"},{"vendor":"red hat","product":"red hat quay 3.15"},{"vendor":"red hat","product":"red hat quay 3.16"},{"vendor":"red hat","product":"red hat quay 3.9"}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175","tags":["Third Party Advisory","web"]},{"url":"https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812274","tags":["web"]},{"url":"https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5","tags":["Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://github.com/kjur/jsrsasign/pull/650","tags":["Issue Tracking","fix","web"]},{"url":"https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195","tags":["Patch","fix","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-4602","tags":["vdb-entry","x_refsource_REDHAT","advisory","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450206","tags":["issue-tracking","x_refsource_REDHAT","report","web"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4602.json","tags":["x_sadp-csaf-vex","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:19409","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:19410","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6912","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6720","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6568","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:19375","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6926","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4602","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8qwj-4jxw-m8jw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4602.json","tags":["advisory"]},{"url":"https://github.com/kjur/jsrsasign","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-4602","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.","status":"published","published":"2026-03-23T05:00:10.567Z","modified":"2026-09-10T12:04:55.802Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-681","CWE-681"],"updated_at":"2026-11-02T14:19:58.944663Z"}],"euvd":[{"id":"EUVD-2026-14379","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.","status":"published","published":"2026-03-23T05:00:10Z","modified":"2026-09-10T12:04:55Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T17:28:25.275283Z"}],"ghsa":[{"id":"GHSA-8qwj-4jxw-m8jw","title":"jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass","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.","status":"published","published":"2026-03-23T06:30:29Z","modified":"2026-07-21T13:42:25Z","cvss":[{"version":"4.0","score":7.7,"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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T14:40:49.410128Z"}],"nvd":[{"id":"CVE-2026-4602","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.","status":"published","published":"2026-03-23T06:16:22.07Z","modified":"2026-09-10T13:20:22.877Z","cvss":[{"version":"4.0","score":7.7,"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/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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-4602","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.","status":"published","published":"2026-03-23T05:00:10.567Z","modified":"2026-10-28T02:30:40.312112766Z","cvss":[{"version":"4.0","score":7.7,"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","level":"high"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T15:45:05.870292Z"},{"id":"GHSA-8qwj-4jxw-m8jw","title":"jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass","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.","status":"published","published":"2026-03-23T06:30:29Z","modified":"2026-07-21T14:00:32.751983961Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":7.7,"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","level":"high"}],"cwes":["CWE-681"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}