Improper Verification of Cryptographic Signature Affecting jsrsasign package, versions <11.1.1
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Test your applications- Snyk IDSNYK-JS-JSRSASIGN-15370940
- published22 Mar 2026
- disclosed16 Feb 2026
- creditKr0emer
Introduced: 16 Feb 2026
CVE-2026-4600 (opens in a new tab)How to fix?
Upgrade jsrsasign to version 11.1.1 or higher.
Overview
jsrsasign is a free pure JavaScript cryptographic library.
Affected versions of this package 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.