# CVE-2026-4599

## Summary

- **CVE ID:** CVE-2026-4599
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1023
- **Published:** Mar 23, 2026
- **Last Modified:** Sep 10, 2026

## 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

- n/a — jsrsasign (7.0.0)
- n/a — org.webjars.npm:jsrsasign (8.0.12)

## References

- [CNA](https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939)
- [CNA](https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20)
- [CNA](https://github.com/kjur/jsrsasign/pull/647)
- [CNA](https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1)
- [CNA](https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812264)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-4599)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2450207)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4599.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:19409)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:19410)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:6720)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:6568)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:19375)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:6912)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:6926)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 39.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._