---
id: CVE-2026-4601
title: >-
  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
summary: >-
  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…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-325
vendor: kjur
product: jsrsasign
affected:
  - jsrsasign < 11.1.1
patched:
  - jsrsasign 11.1.1
published: '2026-03-23'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T13:20:22.510'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4601'
references:
  - url: 'https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586'
    label: report@snyk.io
  - url: >-
      https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb
    label: report@snyk.io
  - url: 'https://github.com/kjur/jsrsasign/pull/645'
    label: report@snyk.io
  - url: 'https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812269'
    label: report@snyk.io
  - url: 'https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941'
    label: report@snyk.io
  - url: 'https://access.redhat.com/errata/RHSA-2026:19375'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:19409'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:19410'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:6568'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:6720'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:6912'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:6926'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-4601'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2450209'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4601.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-4601'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4601'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-03-23T14:41:01.570897Z'
epss: 0.003
epssPercentile: 0.22899
ingestedAt: '2026-07-01T15:50:58.737Z'
---

## Overview

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.

## Affected

- `jsrsasign < 11.1.1`

## Remediation

Upgrade past the affected range:

- `jsrsasign 11.1.1`

## Vendor advisories

- **RHSA-2026:19409** · Red Hat · fixed in: Migration Toolkit for Virtualization 2.1 · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19409)
- **RHSA-2026:19410** · Red Hat · fixed in: Migration Toolkit for Virtualization 2.9 · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19410)
- **RHSA-2026:6912** · Red Hat · fixed in: Red Hat Quay 3.10 · released 2026-04-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:6912)
- **RHSA-2026:6720** · Red Hat · fixed in: Red Hat Quay 3.12 · released 2026-04-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:6720)
- **RHSA-2026:6568** · Red Hat · fixed in: Red Hat Quay 3.15 · released 2026-04-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:6568)
- **RHSA-2026:19375** · Red Hat · fixed in: Red Hat Quay 3.16 · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19375)
- **RHSA-2026:6926** · Red Hat · fixed in: Red Hat Quay 3.9 · released 2026-04-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:6926)