CVE-2026-4599

moderate-risk
Published 2026-03-23

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.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.1/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Jsrsasign

Affected Vendors

Jsrsasign Project

References (4)

Exploit https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20
Patch https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b...
Issue Tracking https://github.com/kjur/jsrsasign/pull/647
Third Party Advisory https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939
36
/ 100
moderate-risk
Severity 31/34 · Critical
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal