Vulnerability in Ollama
CVE-2025-15514
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 · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000
Affected products
- Ollama — versions v0.11.5-rc0, 0.11.5
Weakness classification (CWE)
References
- huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0 (Exploit, technical-description, Patch, Third Party Advisory, exploit)
- ollama.com/ (Product, product)
- https://github.com/ollama/ollama (Product, product)
- www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-d… (Third Party Advisory, third-party-advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2025-15514?
- CVE-2025-15514 is a high-severity vulnerability in Ollama, classified under CWE-395. CVSS score: 7.5/10. Published 2026-01-12.
- How severe is CVE-2025-15514?
- High severity. CVSS v3 base score is 7.5 out of 10.