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GHSA-w8q8-93cx-6h7r

jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction

Source: GitHub Advisory Database (reviewed) High CVE-2026-4601

Packages

EcosystemPackageAffectedFixed in
npm jsrsasign < 11.1.1 11.1.1

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.