CVE-2025-15514

Ollama Multi-Modal Model Image Processing NULL Pointer Dereference

Published Jan 12, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*
Type Values Removed Values Added
CPEs cpe:2.3:a:ollama:ollama:*:-:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:-:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc0:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc1:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc2:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc3:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc4:*:*:*:*:*:*
cpe:2.3:a:ollama:ollama:0.11.5:rc5:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Type Values Removed Values Added
First Time appeared Ollama
Ollama ollama
Vendors & Products Ollama
Ollama ollama
Type Values Removed Values Added
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.
Title Ollama Multi-Modal Model Image Processing NULL Pointer Dereference
Weaknesses CWE-395
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 16, 2026, 12:04 PM
Reserved
Jan 12, 2026, 8:47 PM
Status
Modified
Published
Jan 12, 2026, 11:15 PM
Modified
Aug 17, 2026, 7:16 PM
Severity
Important
Public date
Jan 12, 2026, 11:03 PM