CVE-2025-1975 Improper Validation of Array Index in ollama/ollama
A malicious user can crash the Ollama server by sending a crafted manifest to the model pull endpoint, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-1975?
CVE-2025-1975 is a high-severity denial of service vulnerability in ollama/ollama, published on 16 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-129
Which versions are affected by CVE-2025-1975?
3 open source packages ship an affected version, including github.com/ollama/ollama. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/ollama/ollama Go | All versions | None |
github.com/ollama/ollama Go | All versions to 0.5.11 | None |
github.com/ollama/ollama Go | All versions to 0.5.11 | None |
Products include Ollama Ollama.
How do I fix CVE-2025-1975?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-1975 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-1975 exists.
Other vulnerabilities in ollama/ollama
- CVE-2025-63389 Ollama Platform has missing authentication enabling attackers to perform model management operations
- CVE-2024-45436 Ollama can extract members of a ZIP archive outside of the parent directory
- CVE-2026-7482 Ollama heap out-of-bounds read in GGUF tensor parsing leaks server process memory to unauthenticated remote attackers
- CVE-2024-37032 Ollama does not validate the format of the digest (sha256 with 64 hex digits)
- CVE-2025-15514 Ollama Multi-Modal Model Image Processing NULL Pointer Dereference
Sources
Also known as CLEANSTART-2026-FZ47192, GHSA-wrh5-cmwx-q2qr, GO-2025-3695, MINI-cgmc-v394-687h, MINI-f7vv-h6p6-wjgg.