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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.78% probability · 54th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-395
- Affected
- ollama/ollama
- Source
- disclosure@vulncheck.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.