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.
History

Tue, 13 Jan 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 13 Jan 2026 12:15:00 +0000

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


Tue, 13 Jan 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Ollama
Ollama ollama
Vendors & Products Ollama
Ollama ollama

Mon, 12 Jan 2026 23:15:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-01-12T23:03:52.922Z

Updated: 2026-01-13T17:19:59.689Z

Reserved: 2026-01-12T20:47:18.119Z

Link: CVE-2025-15514

cve-icon Vulnrichment

Updated: 2026-01-13T17:19:56.910Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-12T23:15:51.957

Modified: 2026-01-13T14:03:18.990

Link: CVE-2025-15514

cve-icon Redhat

Severity : Important

Publid Date: 2026-01-12T23:03:52Z

Links: CVE-2025-15514 - Bugzilla