CVE-2026-4601

EUVD-2026-14377
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
snykCNA
8.7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:P
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
jsrsasign_projectjsrsasign
𝑥
< 11.1.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586
https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb
https://github.com/kjur/jsrsasign/pull/645
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941