Threat Investigation
Request a demo

CVE-2026-4601

High

Description

Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.

SeverityHigh
CVSS8.7
Exploit probability—
ProductKjur Jsrsasign
PublishedMar 23, 2026
First seenMar 23, 2026
Weakness typeCWE-325CWE-325

How to fix

Update
  • kjur jsrsasign11.1.1 or later
  • jsrsasign11.1.1 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
kjur jsrsasignv < 11.1.111.1.1
jsrsasignnpmv < 11.1.111.1.1

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.