# CVE-2025-63389: ollama Auth Bypass (Critical 9.8)

🐹

🐹 Go

Not in CISA KEV

CRITICAL severity

# CVE-2025-63389 — ollama

CRITICAL 

CVE-2025-63389 is a critical-severity (CVSS 9.8) Missing Authentication vulnerability in github.com/ollama/ollama. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Ollama Platform has missing authentication enabling attackers to perform model management operations

Also known as[GHSA-f6mr-38g8-39rg](/vulnerability/GHSA-f6mr-38g8-39rg)GO-2025-4251

Published

Dec 18, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

See advisory

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### No confirmed exploitation observed yet

-   CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
-   A successful exploit gives an attacker total control of the affected component, not partial access.
-   CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-63389.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs54th percentile — riskier than 54% of all scored CVEsHighest risk

0.00%0.41%0.81%1.22%0.2%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## How urgent is this, really

## Where this sits among everything scored

## Real-World Exposure

1 pkg affected

🐹`github.com/ollama/ollama`

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

## Description

A critical authentication bypass vulnerability exists in Ollama platform's API endpoints in versions prior to and including v0.12.3. The platform exposes multiple API endpoints without requiring authentication, enabling remote attackers to perform unauthorized model management operations.

## Affected Packages

1 total

Ecosystem

Package

Vulnerable range

Fix

🐹Go

`github.com/ollama/ollama` 

all versions

No fix

## Affected Products

1 product · 1 configurations

Application

`ollama`ollama

≤ 0.12.3

range

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ollama/ollama, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Remediation status
    
    The records we use list no patched version of github.com/ollama/ollama for CVE-2025-63389. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
    
3.  ### Mitigate without a patch
    
    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
    

## Frequently Asked Questions

A critical authentication bypass vulnerability exists in Ollama platform's API endpoints in versions prior to and including v0.12.3. The platform exposes multiple API endpoints without requiring authentication, enabling remote attackers to perform unauthorized model management operations.

O3 Security · Impact-Aware SCA

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