CVE-2026-4602

CVSS 8.7 HIGHEPSS 0.4%CWE-681

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: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

Affected products

n/a · jsrsasign

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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-JS-JSRSASIGN-15371175