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CVE-2026-39410— Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在输入验证错误漏洞，该漏洞源于浏览器Cookie解析与parse函数处理存在差异，可能导致Cookie前缀保护被绕过。

CVSS 4.8 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-39410

Vulnerability Information
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Vulnerability Title
Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在输入验证错误漏洞，该漏洞源于浏览器Cookie解析与parse函数处理存在差异，可能导致Cookie前缀保护被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

II. Public POCs for CVE-2026-39410

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III. Intelligence Information for CVE-2026-39410

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Patches & Fixes for CVE-2026-39410 (1)

Vendor Pages for CVE-2026-39410 (1)

Same Patch Batch · honojs · 2026-04-08 · 5 CVEs total

CVE-2026-39407 5.3 MEDIUM Hono has a middleware bypass via repeated slashes in serveStatic
CVE-2026-39406 5.3 MEDIUM @hono/node-server has a middleware bypass via repeated slashes in serveStatic
CVE-2026-39408 Hono has a path traversal in toSSG() allows writing files outside the output directory
CVE-2026-39409 Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-20

V. Comments for CVE-2026-39410

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