CVE-2026-4602

High

Open

TLP:CLEAR

NVD CVE.org

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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.

Details

CVSS Score: 8.7
EPSS Score ⓘ: 0.49%

39.7th percentile
CVSS 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
Confidence: 90%
Published: Mar 23, 2026
Last Modified: Aug 12, 2026

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