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).
"}],"value":"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)."}],"impacts":[{"capecId":"CAPEC-540","descriptions":[{"lang":"en","value":"CAPEC-540 Overread Buffers"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"YES","Recovery":"AUTOMATIC","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"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/R:A/V:D/RE:L/U:Red","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"LOW"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-04T12:38:28.464Z","orgId":"abd028dc-c042-4c4d-9749-38d0f850af89","shortName":"Echo"},"references":[{"name":"ollama/ollama PR #14406 — ggml: ensure tensor size is valid (fix)","tags":["patch"],"url":"https://github.com/ollama/ollama/pull/14406"},{"name":"Fix commit 88d57d0","tags":["patch"],"url":"https://github.com/ollama/ollama/commit/88d57d0483cca907e0b23a968c83627a20b21047"},{"name":"ollama v0.17.1 release notes","tags":["release-notes"],"url":"https://github.com/ollama/ollama/releases/tag/v0.17.1"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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.
"}],"value":"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."}],"source":{"discovery":"EXTERNAL"},"tags":["x_unauthenticated","x_remote","x_information-disclosure"],"title":"Ollama heap out-of-bounds read in GGUF tensor parsing leaks server process memory to unauthenticated remote attackers","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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.
"}],"value":"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."}]}},"cveMetadata":{"assignerOrgId":"abd028dc-c042-4c4d-9749-38d0f850af89","assignerShortName":"Echo","cveId":"CVE-2026-7482","datePublished":"2026-05-04T12:38:28.464Z","dateReserved":"2026-04-30T06:03:40.622Z","dateUpdated":"2026-05-04T13:48:39.686Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-04 13:16:01","lastModifiedDate":"2026-05-11 12:27:11","problem_types":["CWE-125","CWE-125 CWE-125 Out-of-bounds Read"],"metrics":{"cvssMetricV40":[{"source":"abd028dc-c042-4c4d-9749-38d0f850af89","type":"Secondary","cvssData":{"version":"4.0","vectorString":"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","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"YES","Recovery":"AUTOMATIC","valueDensity":"DIFFUSE","vulnerabilityResponseEffort":"LOW","providerUrgency":"RED"}}],"cvssMetricV31":[{"source":"abd028dc-c042-4c4d-9749-38d0f850af89","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.2}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*","versionEndExcluding":"0.17.1","matchCriteriaId":"18CE34C3-1F67-46CE-8B8D-5B54FC3996EF"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"7482","Ordinal":"1","Title":"Ollama heap out-of-bounds read in GGUF tensor parsing leaks serv","CVE":"CVE-2026-7482","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"7482","Ordinal":"1","NoteData":"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).","Type":"Description","Title":"Ollama heap out-of-bounds read in GGUF tensor parsing leaks serv"}]}}}