CVE-2026-4601

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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."}, {"lang": "es", "value": "Las versiones del paquete jsrsasign anteriores a la 11.1.1 son vulnerables a Paso Criptogr\u00e1fico Faltante a trav\u00e9s del proceso KJUR.crypto.DSA.signWithMessageHash en la implementaci\u00f3n de firma DSA. Un atacante puede recuperar la clave privada forzando a r o s a ser cero, de modo que la biblioteca emite una firma inv\u00e1lida sin reintentar, y luego resuelve para x a partir de la firma resultante."}], "id": "CVE-2026-4601", "lastModified": "2026-09-10T13:20:22.510", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.8, "source": "report@snyk.io", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", 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"confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "report@snyk.io", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4601", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-23T14:41:01.570897Z", "version": "2.0.3"}}]}, "published": "2026-03-23T06:16:21.893", "references": [{"source": "report@snyk.io", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586"}, {"source": "report@snyk.io", "tags": ["Patch"], "url": 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{"bugzilla": {"description": "jsrsasign: jsrsasign: Private Key Recovery via Missing Cryptographic Step in DSA Signing", "id": "2450209", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450209"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-325", "details": ["A flaw was found in jsrsasign. An attacker can exploit a missing cryptographic step in the Digital Signature Algorithm (DSA) signing process, specifically within the KJUR.crypto.DSA.signWithMessageHash function. By manipulating the signature generation to force specific values, the library emits an invalid signature without retrying. This vulnerability allows an attacker to recover the private key used for signing."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-4601", "package_state": [{"cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2", "fix_state": "Affected", "package_name": "migration-toolkit-virtualization/mtv-console-plugin-rhel9", "product_name": "Migration Toolkit for Virtualization"}, {"cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2", "fix_state": "Affected", "package_name": "mtv-candidate/mtv-console-plugin-rhel9", "product_name": "Migration Toolkit for Virtualization"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}], "public_date": "2026-03-23T05:00:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4601\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4601\nhttps://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586\nhttps://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb\nhttps://github.com/kjur/jsrsasign/pull/645\nhttps://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941"], "statement": "IMPORTANT: A flaw in the jsrsasign library allows for private key recovery due to a missing cryptographic step in the Digital Signature Algorithm (DSA) signing process. An attacker can manipulate signature generation within the KJUR.crypto.DSA.signWithMessageHash function to force specific values, enabling the recovery of the private key. This impacts Red Hat products utilizing jsrsasign, such as Migration Toolkit for Virtualization and Red Hat Quay.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.1.1)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}]}, "original": {"product": "jsrsasign", "source": "cna", "vendor": "n/a"}, "product": "jsrsasign", "vendor": "kjur"}], "analysis": {"en": {"generated_at": "2026-03-23T17:22:23.464501+00:00", "value": {"mitigation_remediation": ["Upgrade jsrsasign to version 11.1.1 or later, which restores the missing cryptographic check and prevents private key recovery."], "summary": {"action": "Immediate Patch", "impact": "Private Key Exposure"}, "threat_synthesis": {"affected_systems": "Node.js applications that use the jsrsasign library in versions prior to 11.1.1 are affected. The vulnerability applies to the jsrsasign project\u2019s JavaScript implementation of DSA signing, and any deployment that imports that package without updating to the patched release is at risk.", "description_and_impact": "A missing cryptographic validation step in the DSA signing routine allows an attacker to force the signature components r or s to zero. The library then emits an invalid signature and does not retry, exposing a deterministic relationship that enables the recovery of the private key by solving for x from the resulting signature. The vulnerability is therefore a severe confidentiality breach that exposes private keys used for signing.", "risk_and_exploitability": "The CVSS base score is 9.4, indicating critical severity, and the EPSS score is below 1\u202f%, suggesting that while exploitation is possible, it is not yet widespread. The vulnerability is not listed in the CISA KEV catalog. The likely attack path involves an adversary supplying crafted message or hash data to the DSA.signWithMessageHash routine within the application; the attacker must be able to influence the input to trigger zero r or s values. The inference is that the attack requires either local code execution or the ability to supply data that reaches the signing function, but the vendor\u2019s documentation does not provide additional constraints."}}}}, "created": "2026-03-23T09:45:31.086621+00:00", "updated": "2026-03-25T14:49:48.434281+00:00", "vendors": ["kjur", "kjur$PRODUCT$jsrsasign"]}