GitHub Advisoryadvisory · npm

GHSA-w8q8-93cx-6h7r jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction

HIGH Published 2026-03-23 Modified 2026-03-29 Official page ↗
Aliases
CVE-2026-4601
Ecosystem
npm
Packages
jsrsasign
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Weaknesses
CWE-325
Reviewed
2026-03-29

Affected packages

• npm jsrsasign: < 11.1.1 → fixed in 11.1.1

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.

Related

Alias · CVE (1)

  • CVE-2026-4601 Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash… vulnerability

Weakness · CWE (1)

  • CWE-325 Missing Cryptographic Step weakness

References