Request Body Size Limit Bypass in Hono Web Application Framework
CVE-2025-59139

5.3MEDIUM

Key Information:

Vendor

Honojs

Status
Hono
Vendor
CVE Published:
12 September 2025

What is CVE-2025-59139?

A vulnerability in the Hono Web Application Framework allows attackers to bypass the configured request body size limit due to a conflicting prioritization of HTTP headers. Specifically, the flaw in the bodyLimit middleware fails to correctly disregard the Content-Length header when a Transfer-Encoding: chunked header is present. This misconfiguration can enable oversized request bodies to go unchecked, potentially leading to Denial of Service (DoS) through excessive memory or CPU consumption. The Hono team has released version 4.9.7 to address this issue and ensure compliance with HTTP standards, allowing Transfer-Encoding to take precedence over Content-Length. All users are strongly advised to update to the latest version.

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Affected Version(s)

hono < 4.9.7

References

https://github.com/honojs/hono/security/advisories/GHSA-9...
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https://github.com/honojs/hono/commit/605c70560b52f13af10...
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CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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