Bug 2428828 (CVE-2025-15514)

Summary: CVE-2025-15514 Ollama: Ollama: Denial of Service via malformed image processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: carogers, erezende, haoli, hkataria, jajackso, jcammara, jkoehler, jmitchel, jneedle, jwong, kegrant, koliveir, kshier, lphiri, mabashia, omaciel, pbohmill, pbraun, shvarugh, simaishi, smcdonal, stcannon, teagle, tfister, thavo, ttakamiy, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in Ollama's multi-modal model image processing functionality. A remote attacker can exploit this by sending specially crafted base64-encoded image data to the `/api/chat` endpoint. This malformed input can lead to a null pointer dereference, causing a segmentation fault and crashing the runner process. This results in a denial of service (DoS) condition, making the model unavailable until the service is restarted.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2428872, 2428873    
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Description OSIDB Bzimport 2026-01-13 00:10:38 UTC 
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.