# fastify vulnerable to denial of service via malicious Content-Type

Advisory record · `GHSA-455w-c45v-86rg`

- **Identifiers:** `GHSA-455w-c45v-86rg` · `CVE-2022-39288`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** Yes: CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-754](https://cwe.mitre.org/data/definitions/754.html)
- **Tags:** [CWE-754](https://agentprime.io/advisories/tag/cwe-754.md)
- **Published:** 11 Oct 2022
- **Updated:** 8 Nov 2023
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Oct 2022, 13:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 7.5 (7.0 or more) and EPSS 0.59 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `fastify` (npm): affected `>=4.0.0, <4.8.1`; fixed in `4.8.1`

## 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 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.59, the 99th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 10 Oct 2022, 07:37 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/fastify/fastify/security/advisories/GHSA-455w-c45v-86rg)

## Sources

- [GitHub Advisory Database: GHSA-455w-c45v-86rg](https://github.com/advisories/GHSA-455w-c45v-86rg)
- [OSV: GHSA-455w-c45v-86rg](https://osv.dev/vulnerability/GHSA-455w-c45v-86rg)
- <https://github.com/fastify/fastify/security/advisories/GHSA-455w-c45v-86rg>
- <https://nvd.nist.gov/vuln/detail/CVE-2022-39288>
- <https://github.com/fastify/fastify/commit/fbb07e8dfad74c69cd4cd2211aedab87194618e3>
- <https://github.com/fastify/fastify>
- <https://github.com/fastify/fastify/security/policy>
- <https://hackerone.com/bugs?report_id=1715536&subject=fastify>

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-455w-c45v-86rg>, 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-455w-c45v-86rg/>. Everything for agents: <https://agentprime.io/llms.txt>.