What’s Vulnerable › Vulnerabilities

CVE-2026-4599

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-23 · updated 2026-09-10
• Weakness: CWE-1023

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 products

• jsrsasign: from 7.0.0 before 11.1.1 — fixed in 11.1.1

How to fix

Upgrade to a fixed version: jsrsasign 11.1.1. Check the vendor advisory for mitigations.

References

• https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20
• https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1
• https://github.com/kjur/jsrsasign/pull/647
• https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264
• https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939
• https://access.redhat.com/errata/RHSA-2026:19375
• https://access.redhat.com/errata/RHSA-2026:19409
• https://access.redhat.com/errata/RHSA-2026:19410
• https://access.redhat.com/errata/RHSA-2026:6568
• https://access.redhat.com/errata/RHSA-2026:6720
• https://access.redhat.com/errata/RHSA-2026:6912
• https://access.redhat.com/errata/RHSA-2026:6926

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