CVE-2026-4601

The record

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.

Affected packages

Related vulnerabilities

• GHSA-w8q8-93cx-6h7r jsrsasign: Missing cryptographic validation during DSA signing enables private key… Same vulnerability
• GHSA-464q-cqxq-xhgr jsrsasign: Division by Zero Allows Invalid JWK Modulus to Cause Deterministic Zero Output… Also affects jsrsasign
• GHSA-5jx8-q4cp-rhh6 jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce… Also affects jsrsasign
• GHSA-8qwj-4jxw-m8jw jsrsasign: Negative Exponent Handling Leads to Signature Verification Bypass Also affects jsrsasign
• GHSA-8g7p-jf3g-gxcp jsrsasign is vulnerable to DoS through Infinite Loop when processing zero or negative… Also affects jsrsasign
• GHSA-wvqx-v3f6-w8rh jsrsasign: DSA signatures or X.509 certificates can be forged via DSA domain-parameter… Also affects jsrsasign
• CVE-2026-4603 Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to… Also affects jsrsasign
• CVE-2026-4602 Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion… Also affects jsrsasign