CVE-2026-4601 | BDVDB-2026-322002 Detail
jsrsasign
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.
Weaknesses#
- CWE-325 Missing Cryptographic Step
References#
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812269
- https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586
- https://github.com/kjur/jsrsasign/pull/645
- https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb
- https://access.redhat.com/security/cve/CVE-2026-4601
- https://bugzilla.redhat.com/show_bug.cgi?id=2450209
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4601.json
- https://access.redhat.com/errata/RHSA-2026:19409
- https://access.redhat.com/errata/RHSA-2026:19410
- https://access.redhat.com/errata/RHSA-2026:6912
- https://access.redhat.com/errata/RHSA-2026:6720
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:6926
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.