High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-4601
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 00:00 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-4601
Complete source record
{
"id": "13e0b733e0add4001b970ee968ac885eba65563d15409d27b89692b86d9f5b32",
"url": "https://osv.dev/vulnerability/CVE-2026-4601",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-4601",
"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 to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.",
"evidence": "osv:CVE-2026-4601",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-4601",
"aliases": [
"CVE-2026-4601",
"GHSA-w8q8-93cx-6h7r"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/kjur/jsrsasign",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e2b136e9eab7d571cb4a680ec10361ddc70fd573"
},
{
"fixed": "0710e392ec35de697ce11e4219c988ba2b5fe0eb"
}
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"cpe": "cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:*",
"range": [
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{
"fixed": "11.1.1"
}
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"source": "CPE_RANGE"
},
{
"range": [
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"source": "REFERENCES_COMMIT"
}
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}
],
"versions": [
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4601.json"
}
}
],
"modified": "2026-10-28T02:30:45.398950788Z",
"provider": "osv",
"references": [
"https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586",
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4601.json",
"https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812269",
"https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941",
"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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4601.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-4601",
"https://bugzilla.redhat.com/show_bug.cgi?id=2450209",
"https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb",
"https://github.com/kjur/jsrsasign/pull/645"
],
"provider_metadata": {
"cwe_ids": [
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],
"cna_assigner": "snyk",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "*"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4601.json"
}
},
"related_cves": [
{
"value": "CVE-2026-4601",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 513288,
"published_at": "2026-03-23T05:00:13.312+00:00"
}