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...

CVE-2026-4602

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...

CVE-2026-4598

Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs, allowing an attacker to hang the process permanently by supplying such crafted values e.g.,...

CVE-2026-4602

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...

CVE-2026-4602

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...

CVE-2026-4602

CVE-2026-4602 affects the npm package jsrsasign prior to 11.1.1. The root cause is incorrect conversion between numeric types due to handling negative exponents in ext/jsbn2.js, which can cause modPow with a negative exponent and lead to incorrect modular inverses and broken signature verificatio...

jsrsasign security vulnerability

jsrsasign is a signature verification library developed by Kenji Urushima. Versions of jsrsasign prior to 11.1.1 contained security vulnerabilities. These vulnerabilities stemmed from the bnModInverse function in ext/jsbn2.js, which could cause infinite loops when processing zero or negative...

CVE-2026-4602: Incorrect Conversion between Numeric Types

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...

CVE-2026-4598: Loop with Unreachable Exit Condition

Versions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.modInverse implementation receives zero or negative inputs, allowing an attacker to hang the process permanently by supplying such crafted values e.g.,...

PT-2026-27058

Name of the Vulnerable Software and Affected Versions jsrsasign versions prior to 11.1.1 Description Incorrect Conversion between Numeric Types occurs due to the handling of negative exponents in the file ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break...

jsrsasign security vulnerability

jsrsasign is a signature verification library developed by Kenji Urushima. Versions of jsrsasign prior to 11.1.1 contained security vulnerabilities. These vulnerabilities stemmed from numerical type conversion errors during the handling of negative exponents in the ext/jsbn2.js file, which could...