CVE-2026-65315
Description
A flaw was found in Ollama. A remote attacker can exploit an uncontrolled memory allocation vulnerability in the GGUF metadata parser. By supplying a specially crafted GGUF file, an attacker can manipulate length and count fields, leading to excessive memory allocation. This can cause the server to crash, resulting in a denial of service (DoS).
Statement
This is denial of service vulnerability in Ollama, affecting Red Hat products such as Ansible Automation Platform, Migration Toolkit for Applications, and OpenShift AI. Unauthenticated remote attackers can exploit a flaw in the GGUF metadata parser by uploading a small, crafted file, leading to uncontrolled memory allocation and a complete crash of the Ollama server process. This directly impacts the availability of services relying on Ollama.
Mitigation
To mitigate this issue, restrict network access to the Ollama service. Configure firewall rules to limit incoming connections to the Ollama service port (typically 11434) from known, trusted IP addresses or subnets. This may impact legitimate access if not carefully configured.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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