CVE-2026-44456 Hono: bodyLimit() can be bypassed for chunked / unknown-length requests
Attackers can bypass body size limits in Hono framework using chunked requests, potentially causing resource exhaustion and 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-2026-44456?
CVE-2026-44456 is a medium-severity denial of service vulnerability in honojs hono, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, bodyLimit() does not reliably enforce maxSize for requests without a usable Content-Length (e.g. Transfer-Encoding: chunked). Oversized requests can reach handlers and return 200 instead of 413. This vulnerability is fixed in 4.12.16.
Weakness: CWE-400
Which versions are affected by CVE-2026-44456?
2 open source packages ship an affected version, including hono. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
hono npm | All versions | 4.12.16 |
hono npm | All versions | 4.12.16 |
Products include Hono Hono.
How do I fix CVE-2026-44456?
Upgrade hono to 4.12.16 or later.
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-2026-44456 being exploited?
There is no known exploitation of CVE-2026-44456 in the wild and no public exploit code.
Other vulnerabilities in honojs hono
- CVE-2026-27700 Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo
- CVE-2026-22817 JWT Algorithm Confusion via Unsafe Default (HS256) in Hono JWT Middleware Allows Token Forgery and Auth Bypass
- CVE-2026-22818 JWT algorithm confusion in Hono JWK Auth Middleware when JWK lacks "alg" (untrusted header.alg fallback)
- CVE-2025-62610 Hono Improperly Authorizes JWT Audience Validation
- CVE-2026-29045 Hono: Arbitrary file access via serveStatic vulnerability
Sources
Also known as CLEANSTART-2026-IR86668, CLEANSTART-2026-RU45623, ECHO-c296-2573-9fd1, GHSA-9vqf-7f2p-gf9v, MINI-2r49-hrh3-6hw9, MINI-387f-jfcv-6jqg and 8 more.