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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Ollama Ollama
Default version status: unknown
v0.11.5-rc0 to ≤ 0.13.5affected
pkg:github/ollama/ollamaReferences
- https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0 ↗
- https://ollama.com/ ↗
- https://https://github.com/ollama/ollama ↗
- https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference ↗
- 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 ↗