GHSA-6Q56-MRMC-CPH4
Vulnerability from github – Published: 2026-01-13 00:30 – Updated: 2026-06-30 03:35Ollama 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.
{
"affected": [],
"aliases": [
"CVE-2025-15514"
],
"database_specific": {
"cwe_ids": [
"CWE-395"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-01-12T23:15:51Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-6q56-mrmc-cph4",
"modified": "2026-06-30T03:35:24Z",
"published": "2026-01-13T00:30:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15514"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2025-15514"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2428828"
},
{
"type": "WEB",
"url": "https://https://github.com/ollama/ollama"
},
{
"type": "WEB",
"url": "https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0"
},
{
"type": "WEB",
"url": "https://ollama.com"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-15514.json"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "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/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",
"type": "CVSS_V4"
}
]
}
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