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13 vulnerabilities found for by ollama
CVE-2026-65315 (GCVE-0-2026-65315)
Vulnerability from cvelistv5
Published
2026-07-21 21:18
Modified
2026-07-28 01:06
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Summary
Ollama (HEAD f0078ae) contains an uncontrolled memory allocation vulnerability in the GGUF metadata parser that allows remote attackers to crash the server by supplying a crafted GGUF file with attacker-controlled length and count fields in string lengths, tensor dimension counts, and metadata array counts that are used as allocation sizes without validation against remaining file size. Attackers can upload a sub-1KB crafted GGUF file via the blob upload and model create or pull API endpoints to trigger unrecoverable Go runtime out-of-memory fatal errors or makeslice panics that bypass recovery middleware and crash the entire server process.
References
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CVE-2026-15685 (GCVE-0-2026-15685)
Vulnerability from cvelistv5
Published
2026-07-13 21:30
Modified
2026-07-14 13:05
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-129 - Improper Validation of Array Index
Summary
Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Ollama. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the downloadBlob function. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated array. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-27277.
References
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CVE-2026-7482 (GCVE-0-2026-7482)
Vulnerability from cvelistv5
Published
2026-05-04 12:38
Modified
2026-05-04 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
Summary
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).
References
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CVE-2026-42249 (GCVE-0-2026-42249)
Vulnerability from cvelistv5
Published
2026-04-29 11:44
Modified
2026-04-29 13:20
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
Ollama for Windows contains a Remote Code Execution vulnerability in its update mechanism due to improper handling of attacker‑controlled HTTP response headers. When downloading updates, the application constructs local file paths using values derived from HTTP headers without validation. These values are passed directly to filepath.Join, allowing path traversal sequences (../) to be resolved and enabling files to be written outside the intended update staging directory.
An attacker who can influence update responses can exploit this flaw to write arbitrary executables to attacker‑chosen locations accessible to the current user, including the Windows Startup directory. This allows execution of arbitrary executables.
Critically, when chained with CVE‑2026‑42248 (Missing Signature Verification for Updates), an attacker can deliver malicious payloads that are written to sensitive locations and executed automatically. Because Ollama for Windows performs silent automatic updates and executes staged binaries without user interaction, this results in automatic and persistent code execution without user awareness.
Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
References
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CVE-2026-42248 (GCVE-0-2026-42248)
Vulnerability from cvelistv5
Published
2026-04-29 11:44
Modified
2026-04-29 13:23
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-494 - Download of Code Without Integrity Check
Summary
Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later executed by the application.
Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.
Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
References
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CVE-2025-15514 (GCVE-0-2025-15514)
Vulnerability from cvelistv5
Published
2026-01-12 23:03
Modified
2026-08-17 19:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-395 - Use of NullPointerException Catch to Detect NULL Pointer Dereference
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.
References
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CVE-2025-1975 (GCVE-0-2025-1975)
Vulnerability from cvelistv5
Published
2025-05-16 08:25
Modified
2025-05-16 15:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-129 - Improper Validation of Array Index
Summary
A vulnerability in the Ollama server version 0.5.11 allows a malicious user to cause a Denial of Service (DoS) attack by customizing the manifest content and spoofing a service. This is due to improper validation of array index access when downloading a model via the /api/pull endpoint, which can lead to a server crash.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2024-8063 (GCVE-0-2024-8063)
Vulnerability from cvelistv5
Published
2025-03-20 10:10
Modified
2025-03-20 18:14
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-369 - Divide By Zero
Summary
A divide by zero vulnerability exists in ollama/ollama version v0.3.3. The vulnerability occurs when importing GGUF models with a crafted type for `block_count` in the Modelfile. This can lead to a denial of service (DoS) condition when the server processes the model, causing it to crash.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2025-0312 (GCVE-0-2025-0312)
Vulnerability from cvelistv5
Published
2025-03-20 10:10
Modified
2025-03-20 18:15
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
A vulnerability in ollama/ollama versions <=0.3.14 allows a malicious user to create a customized GGUF model file that, when uploaded and created on the Ollama server, can cause a crash due to an unchecked null pointer dereference. This can lead to a Denial of Service (DoS) attack via remote network.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2024-12886 (GCVE-0-2024-12886)
Vulnerability from cvelistv5
Published
2025-03-20 10:10
Modified
2025-10-15 12:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Summary
An Out-Of-Memory (OOM) vulnerability exists in the `ollama` server version 0.3.14. This vulnerability can be triggered when a malicious API server responds with a gzip bomb HTTP response, leading to the `ollama` server crashing. The vulnerability is present in the `makeRequestWithRetry` and `getAuthorizationToken` functions, which use `io.ReadAll` to read the response body. This can result in excessive memory usage and a Denial of Service (DoS) condition.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2025-0317 (GCVE-0-2025-0317)
Vulnerability from cvelistv5
Published
2025-03-20 10:10
Modified
2025-03-20 14:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-369 - Divide By Zero
Summary
A vulnerability in ollama/ollama versions <=0.3.14 allows a malicious user to upload and create a customized GGUF model file on the Ollama server. This can lead to a division by zero error in the ggufPadding function, causing the server to crash and resulting in a Denial of Service (DoS) attack.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2025-0315 (GCVE-0-2025-0315)
Vulnerability from cvelistv5
Published
2025-03-20 10:09
Modified
2025-03-20 18:34
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
A vulnerability in ollama/ollama <=0.3.14 allows a malicious user to create a customized GGUF model file, upload it to the Ollama server, and create it. This can cause the server to allocate unlimited memory, leading to a Denial of Service (DoS) attack.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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CVE-2024-12055 (GCVE-0-2024-12055)
Vulnerability from cvelistv5
Published
2025-03-20 10:08
Modified
2025-03-20 19:03
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
Summary
A vulnerability in Ollama versions <=0.3.14 allows a malicious user to create a customized gguf model file that can be uploaded to the public Ollama server. When the server processes this malicious model, it crashes, leading to a Denial of Service (DoS) attack. The root cause of the issue is an out-of-bounds read in the gguf.go file.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ollama | ollama/ollama |
Version: unspecified < |
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