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Vulnerability · Published Mar 23, 2026 · Assigned by snyk

CVE-2026-4599

Critical 9.1

In plain English

A critical-severity security flaw in jsrsasign. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.5%top 58.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js; an attacker can recover the private key by exploiting the incorrect compareTo checks that accept out-of-range candidates and thus bias DSA nonces during signature generation.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmjsrsasign11.1.1GHSA-5jx8-q4cp-rhh6

Affected products (as reported)

VendorProductVersions
n/a jsrsasign 7.0.0 – before 11.1.1
n/a org.webjars.npm:jsrsasign 8.0.12 – before *

Weakness: CWE-1023, CWE-338 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References