# Ollama Server Vulnerable to Denial of Service (DoS) Attack

Advisory record · `GHSA-wrh5-cmwx-q2qr`

- **Identifiers:** `GHSA-wrh5-cmwx-q2qr` · `CVE-2025-1975` · `GO-2025-3695` · `PYSEC-2025-145`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-129](https://cwe.mitre.org/data/definitions/129.html)
- **Tags:** [CWE-129](https://agentprime.io/advisories/tag/cwe-129.md)
- **Published:** 16 May 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 16 May 2025, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/ollama/ollama` (Go): affected `<=0.5.11`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Ollama (github.com/ollama/ollama) versions up to and including 0.5.11 are affected. An attacker who can make the server pull a model from a malicious source can send a crafted manifest through the /api/pull endpoint, triggering an array index validation flaw that crashes the server. No fixed version is listed.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0052, the 44th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:14 UTC: First seen by agentprime
- 31 Oct 2026, 14:14 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-wrh5-cmwx-q2qr)

## Sources

- [GitHub Advisory Database: GHSA-wrh5-cmwx-q2qr](https://github.com/advisories/GHSA-wrh5-cmwx-q2qr)
- [OSV: GHSA-wrh5-cmwx-q2qr](https://osv.dev/vulnerability/GHSA-wrh5-cmwx-q2qr)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-1975>
- <https://github.com/ollama/ollama>
- <https://github.com/pypa/advisory-database/tree/main/vulns/ollama/PYSEC-2025-145.yaml>
- <https://huntr.com/bounties/921ba5d4-f1d0-4c66-9764-4f72dffe7acd>
- <https://pkg.go.dev/vuln/GO-2025-3695>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-wrh5-cmwx-q2qr>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-wrh5-cmwx-q2qr/>. Everything for agents: <https://agentprime.io/llms.txt>.