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 exponent.
Weakness
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.
Affected products
- kjur jsrsasign
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
- https://access.redhat.com/errata/RHSA-2026:19375
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