Ollama heap out-of-bounds read in GGUF tensor parsing leaks server process memory to unauthenticated remote attackers
Summary
| CVE | CVE-2026-7482 |
|---|---|
| State | PUBLISHED |
| Assigner | Echo |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-04 13:16:01 UTC |
| Updated | 2026-05-11 12:27:11 UTC |
| Description | Ollama before 0.17.1 contains a heap out-of-bounds read vulnerability in the GGUF model loader. The /api/create endpoint accepts an attacker-supplied GGUF file in which the declared tensor offset and size exceed the file's actual length; during quantization in fs/ggml/gguf.go and server/quantization.go (WriteTo()), the server reads past the allocated heap buffer. The leaked memory contents may include environment variables, API keys, system prompts, and concurrent users' conversation data, and can be exfiltrated by uploading the resulting model artifact through the /api/push endpoint to an attacker-controlled registry. The /api/create and /api/push endpoints have no authentication in the upstream distribution. Default deployments bind to 127.0.0.1, but the documented OLLAMA_HOST=0.0.0.0 configuration is widely used in practice (large public-internet exposure observed). |
Risk And Classification
Primary CVSS: v4.0 8.8 HIGH from abd028dc-c042-4c4d-9749-38d0f850af89
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:D/RE:L/U:Red
EPSS: 0.000990000 probability, percentile 0.271400000 (date 2026-05-12)
Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | abd028dc-c042-4c4d-9749-38d0f850af89 | Secondary | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/... |
| 3.1 | abd028dc-c042-4c4d-9749-38d0f850af89 | Secondary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | CNA | CVSS | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:D/RE:L/U:Red
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/ollama/ollama/pull/14406 | abd028dc-c042-4c4d-9749-38d0f850af89 | github.com | Issue Tracking, Patch |
| github.com/ollama/ollama/commit/88d57d0483cca907e0b23a968c83627a20b21047 | abd028dc-c042-4c4d-9749-38d0f850af89 | github.com | Patch |
| github.com/ollama/ollama/releases/tag/v0.17.1 | abd028dc-c042-4c4d-9749-38d0f850af89 | github.com | Release Notes |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Cyera Research Team (Dor Attias, Ofek Itach) (en)
Additional Advisory Data
Solutions
CNA: Upgrade to ollama 0.17.1 or later. The fix in PR #14406 validates that declared tensor offset+size do not exceed the GGUF file size before reading, and adds a length check in the quantizer prior to the unsafe read.
Workarounds
CNA: Until upgrade is possible: (1) ensure Ollama is bound to a trusted interface only (default OLLAMA_HOST=127.0.0.1); (2) front Ollama with a reverse proxy that requires authentication on /api/create and /api/push; (3) restrict outbound network egress from the Ollama host to prevent exfiltration via /api/push to attacker-controlled registries.