Input validation error in hono - CVE-2026-44456
Published: July 24, 2026
Vulnerability identifier: #VU139282
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44456
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass request size restrictions and reach handler logic with oversized requests.
The vulnerability exists due to improper input validation in the bodyLimit() middleware when handling chunked or unknown-length requests. A remote attacker can send an oversized chunked request to bypass request size restrictions and reach handler logic with oversized requests.
This can occur when the handler does not read the body, reads only the first chunks and returns, or catches and suppresses body read errors.
Affected software
hono
How to mitigate CVE-2026-44456
Install security update from vendor's website.
hono - update to 4.12.16