# CVE-2025-15514

## Summary

- **CVE ID:** CVE-2025-15514
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-395, CWE-395
- **Published:** Jan 12, 2026
- **Last Modified:** Aug 17, 2026

## 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

- Ollama — Ollama (v0.11.5-rc0)

## References

- [CNA](https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0)
- [CNA](https://ollama.com/)
- [CNA](https://https://github.com/ollama/ollama)
- [CNA](https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2025-15514)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2428828)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-15514.json)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.78%
- **EPSS Percentile:** 53.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._