CVE-2025-15514

Summary

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 Software

Weaknesses

• CWE-395: CWE-395: Use of NullPointerException Catch to Detect NULL Pointer Dereference

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Ollama: Ollama: Denial of Service via malformed image processing

Additional References

• 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

References

• 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

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