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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.

PUBLISHED Reserved 2026-03-22 | Published 2026-03-23 | Updated 2026-03-23 | Assigner snyk




CRITICAL: 9.4CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:N/E:P
HIGH: 8.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:P

Problem types

Missing Cryptographic Step

Credits

Kr0emer

References

security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941

gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586

github.com/kjur/jsrsasign/pull/645

github.com/...ommit/0710e392ec35de697ce11e4219c988ba2b5fe0eb

cve.org (CVE-2026-4601)

nvd.nist.gov (CVE-2026-4601)

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