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.

• CWE-395
• CWE-395

• https://https://github.com/ollama/ollamaProduct
• https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0Exploit, Patch, Third Party Advisory
• https://ollama.com/Product
• https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereferenceThird Party Advisory
• 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

Published

Jan 12, 2026

Last Modified

Aug 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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