{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86231", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-09-06T08:04:47.571Z", "datePublished": "2026-09-06T22:45:12.262Z", "dateUpdated": "2026-09-06T22:45:12.262Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-09-06T22:45:12.262Z"}, "title": "mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-299", "lang": "en", "description": "Improper Check for Certificate Revocation"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-298", "lang": "en", "description": "Improper Validation of Certificate Expiration"}]}], "affected": [{"vendor": "mwiede", "product": "jsch", "versions": [{"version": "2.28.0", "status": "affected"}, {"version": "2.28.1", "status": "affected"}, {"version": "2.28.2", "status": "affected"}, {"version": "2.28.3", "status": "affected"}, {"version": "2.28.4", "status": "affected"}, {"version": "2.28.5", "status": "affected"}, {"version": "2.28.6", "status": "unaffected"}], "cpes": ["cpe:2.3:a:mwiede:jsch:*:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 6.3, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 3.7, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C", "baseSeverity": "LOW"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 3.7, "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C", "baseSeverity": "LOW"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 2.6, "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C"}}], "timeline": [{"time": "2026-09-06T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-09-06T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-09-06T10:09:53.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "Yu Bao from PayPal Cyber Security Team (VulDB User)", "type": "reporter"}], "references": [{"url": "https://vuldb.com/vuln/399388", "name": "VDB-399388 | mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/399388/cti", "name": "VDB-399388 | CTI Indicators (IOB, IOC, TTP, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/cve/CVE-2026-86231", "name": "CVE-2026-86231 | CVE Analysis and Report", "tags": ["third-party-advisory"]}, {"url": "https://vuldb.com/submit/898485", "name": "Submit #898485 | mwiede jsch 2.28.4 Cert Revocation Type String Bypass", "tags": ["third-party-advisory"]}, {"url": "https://github.com/mwiede/jsch/issues/1091", "tags": ["exploit", "issue-tracking"]}, {"url": "https://github.com/mwiede/jsch/pull/1098", "tags": ["issue-tracking", "patch"]}, {"url": "https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23", "tags": ["patch"]}, {"url": "https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6", "tags": ["patch"]}, {"url": "https://github.com/mwiede/jsch/", "tags": ["product"]}], "tags": ["x_open-source"], "x_generator": ["VulDB PVTS v202609"]}}}

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{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:mwiede:jsch:*:*:*:*:*:*:*:*"], "product": "jsch", "vendor": "mwiede", "versions": [{"status": "affected", "version": "2.28.0"}, {"status": "affected", "version": "2.28.1"}, {"status": "affected", "version": "2.28.2"}, {"status": "affected", "version": "2.28.3"}, {"status": "affected", "version": "2.28.4"}, {"status": "affected", "version": "2.28.5"}, {"status": "unaffected", "version": "2.28.6"}]}], "source": "cna@vuldb.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component."}], "id": "CVE-2026-86231", "lastModified": "2026-09-06T23:17:39.157", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.6, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 4.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.9, "baseSeverity": "LOW", "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": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/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": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}]}, "published": "2026-09-06T23:17:39.157", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/mwiede/jsch/"}, {"source": "cna@vuldb.com", "url": "https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23"}, {"source": "cna@vuldb.com", "url": "https://github.com/mwiede/jsch/issues/1091"}, {"source": "cna@vuldb.com", "url": "https://github.com/mwiede/jsch/pull/1098"}, {"source": "cna@vuldb.com", "url": "https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/cve/CVE-2026-86231"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/898485"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/399388"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/399388/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-298"}, {"lang": "en", "value": "CWE-299"}], "source": "cna@vuldb.com", "type": "Primary"}]}

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