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Vulnerability · Published Mar 23, 2026 · Assigned by snyk

CVE-2026-4602

High 7.5

In plain English

A high-severity security flaw in jsrsasign. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 57.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmjsrsasign11.1.1GHSA-8qwj-4jxw-m8jw

Affected products (as reported)

VendorProductVersions
n/a jsrsasign 0 – before 11.1.1
n/a org.webjars.npm:jsrsasign 0 – before *

Weakness: CWE-681 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P

References