Ollama Multi-Modal Model Image Processing NULL Pointer Dereference_CVE-2025-15514

{
    "lastseen": "",
    "description": "Ollama 0.11.5-rc0 through current version 0.13.5 contain a null pointer dereference vulnerability in the multi-modal model image processing functionality. When processing base64-encoded image data via the /api/chat endpoint, the application fails to validate that the decoded data represents valid media before passing it to the mtmd_helper_bitmap_init_from_buf function. This function can return NULL for malformed input, but the code does not check this return value before dereferencing the pointer in subsequent operations. A remote attacker can exploit this by sending specially crafted base64 image data that decodes to invalid media, causing a segmentation fault and crashing the runner process. This results in a denial of service condition where the model becomes unavailable to all users until the service is restarted.",
    "published": "2026-01-12T23:03:52.922Z",
    "modified": "2026-01-12T23:03:52.922Z",
    "type": "cve",
    "title": "Ollama Multi-Modal Model Image Processing NULL Pointer Dereference",
    "source": "VulnCheck",
    "references": "https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0\nhttps://ollama.com/\nhttps://https://github.com/ollama/ollama\nhttps://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference",
    "id": "CVE-2025-15514",
    "bulletinFamily": "",
    "cwe": [
        "CWE-395"
    ],
    "cvelist": null,
    "sourceData": "Ollama Ollama v0.11.5-rc0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Ollama",
    "version": "v0.11.5-rc0",
    "vendor": "Ollama",
    "ai_description": "Null pointer dereference vulnerability in multi-modal model image processing functionality, allowing remote attackers to cause a denial of service via specially crafted base64 image data.",
    "ai_severity": "High",
    "ai_vendor": "Ollama",
    "ai_product": "Ollama",
    "ai_version": "v0.11.5-rc0, v0.13.5",
    "ai_score": 8.7
}