CVE-2026-4601
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.4epss 0.3%
exploitation probability
0.3%top 78% of all CVEs
observed exploitation
nono source reports it
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.
CVSS: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
References
https://access.redhat.com/errata/RHSA-2026:19375https://access.redhat.com/errata/RHSA-2026:19409https://access.redhat.com/errata/RHSA-2026:19410https://access.redhat.com/errata/RHSA-2026:6568https://access.redhat.com/errata/RHSA-2026:6720https://access.redhat.com/errata/RHSA-2026:6912https://access.redhat.com/errata/RHSA-2026:6926https://access.redhat.com/security/cve/CVE-2026-4601https://bugzilla.redhat.com/show_bug.cgi?id=2450209https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0ebhttps://github.com/kjur/jsrsasign/pull/645