CVE-2026-4600
High
Description
Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.
SeverityHigh
CVSS7.4
Exploit probability—
ProductKjur Jsrsasign
PublishedMar 23, 2026
First seenMar 23, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- kjur jsrsasign11.1.1 or later
- jsrsasign11.1.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kjur jsrsasign | v < 11.1.1 | 11.1.1 |
| jsrsasignnpm | v < 11.1.1 | 11.1.1 |
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