CVE-2026-42248

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42248", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-04-25T11:31:56.229Z", "datePublished": "2026-04-29T11:44:33.770Z", "dateUpdated": "2026-04-29T13:23:07.650Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "platforms": ["Windows"], "product": "Ollama", "repo": "https://github.com/ollama/ollama", "vendor": "Ollama", "versions": [{"lessThanOrEqual": "0.17.5", "status": "affected", "version": "0.12.10", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Bart\u0142omiej Dmitruk (striga.ai)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.<br><br><span style=\"background-color: rgb(255, 255, 255);\">Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.</span><br><br>Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.<br>"}], "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\n\nCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\n\nMaintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable."}], "impacts": [{"capecId": "CAPEC-186", "descriptions": [{"lang": "en", "value": "CAPEC-186 Malicious Software Update"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "baseScore": 7.7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-494", "description": "CWE-494: Download of Code Without Integrity Check", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-04-29T11:44:33.770Z"}, "references": [{"tags": ["third-party-advisory"], "url": "https://cert.pl/en/posts/2026/04/CVE-2026-42248/"}, {"tags": ["product"], "url": "https://ollama.com/"}], "source": {"discovery": "EXTERNAL"}, "tags": ["x_open-source"], "title": "Missing Signature Verification for Updates in Ollama", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-29T13:21:11.854543Z", "id": "CVE-2026-42248", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-29T13:23:07.650Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42248", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-04-29T13:21:11.854543Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-29T13:21:16.102Z"}}], "cna": {"tags": ["x_open-source"], "title": "Missing Signature Verification for Updates in Ollama", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Bart\u0142omiej Dmitruk (striga.ai)"}], "impacts": [{"capecId": "CAPEC-186", "descriptions": [{"lang": "en", "value": "CAPEC-186 Malicious Software Update"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.7, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/ollama/ollama", "vendor": "Ollama", "product": "Ollama", "versions": [{"status": "affected", "version": "0.12.10", "versionType": "semver", "lessThanOrEqual": "0.17.5"}], "platforms": ["Windows"], "defaultStatus": "unknown"}], "references": [{"url": "https://cert.pl/en/posts/2026/04/CVE-2026-42248/", "tags": ["third-party-advisory"]}, {"url": "https://ollama.com/", "tags": ["product"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\n\nCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\n\nMaintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.", "supportingMedia": [{"type": "text/html", "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.<br><br><span style=\"background-color: rgb(255, 255, 255);\">Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.</span><br><br>Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.<br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-494", "description": "CWE-494: Download of Code Without Integrity Check"}]}], "providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-04-29T11:44:33.770Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42248", "state": "PUBLISHED", "dateUpdated": "2026-04-29T13:23:07.650Z", "dateReserved": "2026-04-25T11:31:56.229Z", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "datePublished": "2026-04-29T11:44:33.770Z", "assignerShortName": "CERT-PL"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "platforms": ["Windows"], "product": "Ollama", "repo": "https://github.com/ollama/ollama", "vendor": "Ollama", "versions": [{"lessThanOrEqual": "0.17.5", "status": "affected", "version": "0.12.10", "versionType": "semver"}]}], "source": "cvd@cert.pl"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*", "matchCriteriaId": "17F8EF1F-C63F-4801-84A0-5D2BE7412CCA", "versionEndIncluding": "0.17.5", "versionStartIncluding": "0.12.10", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\n\nCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\n\nMaintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable."}, {"lang": "es", "value": "Ollama para Windows no realiza verificaci\u00f3n de integridad o autenticidad de los ejecutables de actualizaci\u00f3n descargados. A diferencia de otras plataformas, la implementaci\u00f3n para Windows de la rutina de verificaci\u00f3n de actualizaciones devuelve \u00e9xito incondicionalmente, por lo que no se realiza ninguna firma digital o validaci\u00f3n de confianza antes de la preparaci\u00f3n o ejecuci\u00f3n de las cargas \u00fatiles de actualizaci\u00f3n, lo que permite que los ejecutables proporcionados por el atacante sean aceptados y posteriormente ejecutados por la aplicaci\u00f3n.\n\nCr\u00edticamente, Ollama para Windows realiza actualizaciones autom\u00e1ticas silenciosas, por lo que la carga \u00fatil maliciosa puede instalarse autom\u00e1ticamente sin el conocimiento del usuario.\n\nLos mantenedores de este proyecto fueron notificados con antelaci\u00f3n sobre esta vulnerabilidad, pero no respondieron con los detalles de la vulnerabilidad o el rango de versiones vulnerables. Las versiones de 0.12.10 a 0.17.5 fueron probadas y confirmadas como vulnerables, otras versiones no fueron probadas pero tambi\u00e9n podr\u00edan ser vulnerables."}], "id": "CVE-2026-42248", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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": "LOW", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42248", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-29T13:21:11.854543Z", "version": "2.0.3"}}]}, "published": "2026-04-29T12:16:18.917", "references": [{"source": "cvd@cert.pl", "tags": ["Third Party Advisory"], "url": "https://cert.pl/en/posts/2026/04/CVE-2026-42248/"}, {"source": "cvd@cert.pl", "tags": ["Product"], "url": "https://ollama.com/"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-494"}], "source": "cvd@cert.pl", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["windows"], "status": "affected", "versions": {"scheme": "semver", "value": "[0.12.10,0.17.5]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Ollama", "source": "cna", "vendor": "Ollama"}, "product": "ollama", "vendor": "ollama"}], "created": "2026-04-29T13:30:11.816818+00:00", "updated": "2026-04-29T17:15:16.213473+00:00", "vendors": ["ollama", "ollama$PRODUCT$ollama"]}