The jsrsasign library is vulnerable to incomplete comparison checks in cryptographic functions, allowing attackers to bias DSA nonces and recover priv...
Description
The jsrsasign library is vulnerable to incomplete comparison checks in cryptographic functions, allowing attackers to bias DSA nonces and recover private keys.
AI Analyst Comment
Remediation
Update Unknown Multiple Products to the latest version. Monitor for exploitation attempts and review access logs.
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VENDOR: jsrsasign
PRODUCT: jsrsasign
AFFECTED_VERSIONS: 7.0.0 to 11.1.1
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Description Summary:
The jsrsasign library is vulnerable to incomplete comparison checks in cryptographic functions, allowing attackers to bias DSA nonces and recover private keys.
Executive Summary:
A critical cryptographic flaw in the jsrsasign library allows remote attackers to recover private keys by exploiting biased DSA nonces caused by incorrect comparison logic.
Vulnerability Details
CVE-ID: CVE-2026-4599
Affected Software: jsrsasign jsrsasign
Affected Versions: Versions 7.0.0 before 11.1.1
Vulnerability: This vulnerability involves an Incomplete Comparison with Missing Factors within the
getRandomBigIntegerZeroToMaxandgetRandomBigIntegerMinToMaxfunctions. An unauthenticated attacker can exploit incorrectcompareTochecks that accept out-of-range candidates, biasing DSA nonces during signature generation and leading to private key recovery.Business Impact
A successful exploit of this vulnerability results in the total compromise of cryptographic identity. If an attacker recovers a private key, they can impersonate the affected entity, decrypt sensitive communications, and forge digital signatures. Given the CVSS score of 9.1, this represents a critical risk to data integrity and confidentiality across any system utilizing the affected library versions for secure communications.
Remediation Plan
Immediate Action: Update the jsrsasign library to version 11.1.1 or later immediately to patch the flawed cryptographic comparison logic.
Proactive Monitoring: Review application logs for unusual cryptographic activity and consider rotating any private keys that were utilized by the vulnerable library versions.
Compensating Controls: Implement strict input validation for cryptographic operations and ensure that sensitive key management is handled within secure, hardware-backed environments where possible.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of March 23, 2026, there is no public information indicating active exploitation of this vulnerability. However, because the flaw allows for the direct recovery of private keys, the potential for targeted exploitation is extremely high once the technical details are analyzed by threat actors.
Analyst Recommendation
The severity of this cryptographic flaw cannot be overstated, as it undermines the fundamental security of the jsrsasign library. Organizations must prioritize the update to version 11.1.1 immediately. Failure to remediate this vulnerability leaves sensitive data and digital identities exposed to total compromise.