Ollama up to 0.34.9 Digest Validation /api/pull digestToPath path traversal

Summaryinfo

A vulnerability classified as very critical was found in Ollama up to 0.34.9. Affected by this issue is the function digestToPath of the file /api/pull of the component Digest Validation. Such manipulation leads to path traversal. This vulnerability is traded as CVE-2026-103663. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Ollama up to 0.34.9. It has been rated as very critical. Affected by this issue is the function digestToPath of the file /api/pull of the component Digest Validation. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.  Critically 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. This issue was fixed in version 0.35.0.

The advisory is available at cert.pl. This vulnerability is handled as CVE-2026-103663 since 10/01/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/08/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 0.35.0 eliminates this vulnerability.

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Productinfo

Name

• Ollama

Version

• 0.34.0
• 0.34.1
• 0.34.2
• 0.34.3
• 0.34.4
• 0.34.5
• 0.34.6
• 0.34.7
• 0.34.8
• 0.34.9

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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