Is CVE-2026-4599 actively exploited?

No active exploitation of CVE-2026-4599 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4599 be exploited remotely?

Yes. CVE-2026-4599 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4599?

CVE-2026-4599 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-4599

CWE-1023Published: March 23, 2026· Updated: Jul 15, 2026

9.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.9th

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.

NVD Source

Risk Analysis

This critical vulnerability in jsrsasign allows an attacker to recover private keys by exploiting incorrect comparison checks that bias DSA nonces during signature generation. With a CVSS score of 9.1, this flaw could lead to severe compromise of cryptographic integrity. There is no EPSS score to indicate exploitation likelihood, and it is not in CISA's KEV catalog.

No public exploit is known for this vulnerability, but it is remotely exploitable without authentication. The low attack complexity makes it a significant concern for systems relying on jsrsasign for cryptographic operations.

Recommended Action

Upgrade jsrsasign to version 11.1.1 or later to address this cryptographic flaw. Review and update any applications or systems that utilize this library.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-4599 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.