PT-2026-27055 · Jsrsasign · Jsrsasign

Kr0Emer · Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-4599

Mitre

CVSS v3.1

9.1

Critical

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Exploit

Fix

Weakness Enumeration

CWE-1023

Related Identifiers

CVE-2026-4599

Affected Products

Jsrsasign

References · 9

• 🔥 https://gist.github.com/Kr0emer/081681818b51605c91945126d74b4f20 · Exploit
• https://github.com/kjur/jsrsasign/commit/ee4b013478366cb16cea9a4bdfb218b6077f83b1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-4599 · Security Note
• https://github.com/kjur/jsrsasign/pull/647 · Note
• https://twitter.com/TheHackerWire/status/2035964125222945059 · Twitter Post
• https://twitter.com/CveFindCom/status/2035970455304126545 · Twitter Post
• https://twitter.com/CVEnew/status/2035992477576937652 · Twitter Post
• https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370939 · Note
• https://twitter.com/VulmonFeeds/status/2035981146979226080 · Twitter Post