CVE-2026-4602

EUVD-2026-14379
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
snykCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
jsrsasign_projectjsrsasign
𝑥
< 11.1.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
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