jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-4602US | — | — | ||
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 for… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:19375WEB
- https://access.redhat.com/errata/RHSA-2026:19409WEB
- https://access.redhat.com/errata/RHSA-2026:19410WEB
- https://access.redhat.com/errata/RHSA-2026:6568WEB
- https://access.redhat.com/errata/RHSA-2026:6720WEB
- https://access.redhat.com/errata/RHSA-2026:6912WEB
- https://access.redhat.com/errata/RHSA-2026:6926WEB
- https://access.redhat.com/security/cve/CVE-2026-4602WEB
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