CVE-2026-4601Versions 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.
Updated under an hour ago ()
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It affects Red Hat Migration Toolkit for Virtualization 2.1 and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:P
- Weakness (CWE)
- CWE-325
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- snyk
- NVD analysis
- Modified
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Migration Toolkit for Virtualization 2.1 redhat:migration_toolkit_virtualization | from 1779139872 not affected | CISA ADP |
Red Hat Red Hat Quay 3.10 redhat:quay | from 1775169155 not affected | CISA ADP |
kjur jsrsasign kjur:jsrsasign | before 11.1.1 | NVD |
References
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941third-party-advisory
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812269
- https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586exploit, mitigation, third-party-advisory
- https://github.com/kjur/jsrsasign/pull/645issue-tracking
- https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0ebpatch
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:19409
- https://access.redhat.com/errata/RHSA-2026:19410
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:6720
- https://access.redhat.com/errata/RHSA-2026:6912
- https://access.redhat.com/errata/RHSA-2026:6926
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.