| Component | Ollama |
| Severity | high (CVSS 7.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-01-12 |
| Last modified | 2026-08-17 |
| Affected versions | ollama >= 0.11.6, <= 0.13.5 ollama = 0.11.5 ollama = 0.11.5 ollama = 0.11.5 ollama = 0.11.5 ollama = 0.11.5 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-395 |
| CISA KEV | not listed |
NVD 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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep Ollama off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2025-15514
- https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0
- https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference
- https://https://github.com/ollama/ollama
- https://ollama.com/
- https://access.redhat.com/security/cve/CVE-2025-15514
- https://bugzilla.redhat.com/show_bug.cgi?id=2428828
- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-15514.json
Read more
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