CVE-2026-4602
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
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
References
https://access.redhat.com/errata/RHSA-2026:19375https://access.redhat.com/errata/RHSA-2026:19409https://access.redhat.com/errata/RHSA-2026:19410https://access.redhat.com/errata/RHSA-2026:6568https://access.redhat.com/errata/RHSA-2026:6720https://access.redhat.com/errata/RHSA-2026:6912https://access.redhat.com/errata/RHSA-2026:6926https://access.redhat.com/security/cve/CVE-2026-4602https://bugzilla.redhat.com/show_bug.cgi?id=2450206https://gist.github.com/Kr0emer/7ecd2be7d17419e4677315ef3758faf5https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195https://github.com/kjur/jsrsasign/pull/650