CVE-2026-35387

{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2026-35387", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-04-02T16:52:52.884Z", "datePublished": "2026-04-02T16:52:53.623Z", "dateUpdated": "2026-04-03T13:07:56.358Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSH", "vendor": "OpenBSD", "versions": [{"lessThan": "10.3", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-670", "description": "CWE-670 Always-Incorrect Control Flow Implementation", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-04-02T18:16:21.122Z"}, "references": [{"url": "https://www.openssh.org/releasenotes.html#10.3p1"}, {"url": "https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2"}, {"url": "https://www.openwall.com/lists/oss-security/2026/04/02/3"}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.3"}]}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-03T13:07:49.157611Z", "id": "CVE-2026-35387", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-03T13:07:56.358Z"}}]}, "dataVersion": "5.2"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-35387", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-03T13:07:49.157611Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-03T13:07:53.196Z"}}], "cna": {"metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.1, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "OpenBSD", "product": "OpenSSH", "versions": [{"status": "affected", "version": "0", "lessThan": "10.3", "versionType": "custom"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://www.openssh.org/releasenotes.html#10.3p1"}, {"url": "https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2"}, {"url": "https://www.openwall.com/lists/oss-security/2026/04/02/3"}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}, "descriptions": [{"lang": "en", "value": "OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-670", "description": "CWE-670 Always-Incorrect Control Flow Implementation"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "10.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-04-02T18:16:21.122Z"}}}, "cveMetadata": {"cveId": "CVE-2026-35387", "state": "PUBLISHED", "dateUpdated": "2026-04-03T13:07:56.358Z", "dateReserved": "2026-04-02T16:52:52.884Z", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "datePublished": "2026-04-02T16:52:53.623Z", "assignerShortName": "mitre"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSH", "vendor": "OpenBSD", "versions": [{"lessThan": "10.3", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*", "matchCriteriaId": "F40F50BC-86AA-4D7F-88A5-A244CD7606F3", "versionEndExcluding": "10.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms."}, {"lang": "es", "value": "OpenSSH anterior a la 10.3 puede usar algoritmos ECDSA no previstos. El listado de cualquier algoritmo ECDSA en PubkeyAcceptedAlgorithms o HostbasedAcceptedAlgorithms se malinterpreta como que significa todos los algoritmos ECDSA."}], "id": "CVE-2026-35387", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "cve@mitre.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35387", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-03T13:07:49.157611Z", "version": "2.0.3"}}]}, "published": "2026-04-02T17:16:27.790", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2"}, {"source": "cve@mitre.org", "tags": ["Release Notes"], "url": "https://www.openssh.org/releasenotes.html#10.3p1"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://www.openwall.com/lists/oss-security/2026/04/02/3"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-670"}], "source": "cve@mitre.org", "type": "Secondary"}]}

{"bugzilla": {"description": "OpenSSH: OpenSSH: Information disclosure due to unintended cryptographic algorithm usage", "id": "2454494", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454494"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-115", "details": ["OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.", "A flaw was found in OpenSSH. This vulnerability allows the system to use unintended Elliptic Curve Digital Signature Algorithm (ECDSA) algorithms. This occurs because the configuration for accepted public key algorithms is misinterpreted, leading to the use of weaker cryptographic methods than intended. This could potentially allow an attacker to compromise the confidentiality of data."], "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-2026-35387", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-02T16:52:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-35387\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35387\nhttps://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2\nhttps://www.openssh.org/releasenotes.html#10.3p1\nhttps://www.openwall.com/lists/oss-security/2026/04/02/3"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,10.3)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSH", "source": "cna", "vendor": "OpenBSD"}, "product": "openssh", "vendor": "openbsd"}], "analysis": {"en": {"generated_at": "2026-04-04T03:57:16.556094+00:00", "value": {"mitigation_remediation": ["Upgrade OpenSSH to version 10.3 or later.", "Verify that PubkeyAcceptedAlgorithms and HostbasedAcceptedAlgorithms do not contain inadvertent ECDSA algorithm entries."], "summary": {"action": "Assess Impact", "impact": "Information disclosure by unintended cryptographic algorithm use"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the OpenBSD OpenSSH implementation. All releases before 10.3 are impacted, including OpenSSH 10.2 and earlier. No specific patch versions are listed beyond the recommendation to upgrade to 10.3 or newer.", "description_and_impact": "OpenSSH versions prior to 10.3 incorrectly interpret any listing of an ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms as an instruction to accept all ECDSA algorithms. This misinterpretation can expose sensitive cryptographic information, potentially allowing a malicious actor to learn details about accepted key types or infer configuration settings. The weakness is rooted in cryptographic confusion and unexpected behavior described by CWE-115 and CWE-670.", "risk_and_exploitability": "The CVSS score of 3.1 indicates a low overall severity, and the EPSS (exploit probability) score is below 1%, suggesting a very low likelihood of exploitation in the wild. The vulnerability is not currently listed in the CISA known exploited vulnerabilities catalog. The attack vector is inferred to be remote via an SSH connection, where an attacker could craft or alter the algorithm list in a client or server configuration to trigger the information disclosure. Because no immediate exploitation code is documented, the risk remains low but the potential for sensitive data exposure exists."}}}}, "created": "2026-04-03T07:32:30.087132+00:00", "updated": "2026-04-07T07:55:56.230588+00:00", "vendors": ["openbsd", "openbsd$PRODUCT$openssh"]}