CVE-2025-15514: ollama

Vulnerability summary

CVE-2025-15514 is a high (CVSS 8.7) vulnerability in ollama. EPSS estimates a 0.77% chance of exploitation in the next 30 days, higher than 54.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 12-01-2026
   PublishedVulnerability first disclosed.
2. 16-09-2026
   Last modifiedVulnerability information updated.

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.

• CWE-395Use of NullPointerException Catch to Detect NULL Pointer DereferenceCatching NullPointerException should not be used as an alternative to programmatic checks to prevent dereferencing a null pointer.