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.
References (15)
Core 15
Core References
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19375
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19409
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19410
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6568
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6720
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6912
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6926
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-4602
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2450206
Scores
CVSS v3
7.5
EPSS
0.0049
EPSS Percentile
39.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-681
Status
published
Products (6)
None/jsrsasign
< 11.1.1
None/org.webjars.npm:jsrsasign
jsrsasign_project/jsrsasign
< 11.1.1
kjur/jsrsasign
< 11.1.1
n/a/jsrsasign
< 11.1.1
npm/jsrsasign
0 - 11.1.1npm
Published
Mar 23, 2026
Tracked Since
Mar 23, 2026