CVE-2026-103663

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An unauthenticated remote attacker can specify a path traversal sequence as a layer digest, causing a malicious binary to be written outside the model store.\u00a0\n\nCritically if the server process has write access to `/usr/lib/ollama` (the default in most Ollama Docker images), an attacker can write the malicious file to that directory. On the next server restart, the file is loaded and executed, resulting in remote code execution as root.\n\n\nThis issue was fixed in version\u00a00.35.0.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>Ollama is vulnerable to path traversal in the `/api/pull` endpoint due to insufficient validation of layer digests by the `digestToPath` function. 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On the next server restart, the file is loaded and executed, resulting in remote code execution as root.</span></div><div><br>This issue was fixed in version&nbsp;<span>0.35.0.</span></div>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/en/posts/2026/10/CVE-2026-103663/", "tags": ["third-party-advisory"]}, {"url": "https://ollama.com/", "tags": ["product"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "Server process does not have write access to `/usr/lib/ollama`"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "Server process has write access to `/usr/lib/ollama`"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.4, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}}], "credits": [{"lang": "en", "value": "Bart\u0142omiej Dmitruk (striga.ai)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-08T14:04:06.230233Z", "id": "CVE-2026-103663", "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": "2026-10-08T14:04:14.270Z"}}]}}

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On the next server restart, the file is loaded and executed, resulting in remote code execution as root.</span></div><div><br>This issue was fixed in version&nbsp;<span>0.35.0.</span></div>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-23", "description": "CWE-23 Relative Path Traversal"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-913", "description": "CWE-913 Improper Control of Dynamically-Managed Code Resources"}]}], "providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-10-08T13:19:04.819Z"}}}, "cveMetadata": {"cveId": "CVE-2026-103663", "state": "PUBLISHED", "dateUpdated": "2026-10-08T14:04:14.270Z", "dateReserved": "2026-10-01T08:54:20.991Z", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "datePublished": "2026-10-08T13:19:04.819Z", "assignerShortName": "CERT-PL"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "Ollama: Path Traversal leading to Remote Code Execution in Ollama", "id": "2547956", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547956"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-22", "details": ["Ollama is vulnerable to path traversal in the `/api/pull` endpoint due to insufficient validation of layer digests by the `digestToPath` function. An unauthenticated remote attacker can specify a path traversal sequence as a layer digest, causing a malicious binary to be written outside the model store.\u00a0\nCritically if the server process has write access to `/usr/lib/ollama` (the default in most Ollama Docker images), an attacker can write the malicious file to that directory. On the next server restart, the file is loaded and executed, resulting in remote code execution as root.\nThis issue was fixed in version\u00a00.35.0.", "A flaw was found in Ollama. This vulnerability allows an unauthenticated remote attacker to achieve arbitrary code execution by exploiting a path traversal flaw in the model pull application programming interface (API) endpoint. By supplying a crafted layer identifier, an attacker can write malicious files outside the intended storage location. If these files are written to executable application directories, the server loads and executes them upon restart, compromising the host system."], "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-2026-103663", "package_state": [{"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Not affected", "package_name": "mta/mta-solution-server-rhel9", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-24/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-25/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-10-08T13:19:04Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-103663\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-103663\nhttps://cert.pl/en/posts/2026/10/CVE-2026-103663/\nhttps://ollama.com/"], "statement": "Moderate impact is assigned to this flaw because achieving code execution requires specific write permissions to privileged system directories, limiting the blast radius under standard constrained deployments. Although upstream services risk arbitrary file writes when processing manipulated layer requests, Red Hat enterprise products do not ship the vulnerable implementation. Consequently, Red Hat products and container offerings are not affected by this vulnerability.", "threat_severity": "Moderate"}

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