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CVE-2026-71848— Hono: Algorithmic Complexity DoS in Language Middleware

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组织开源的一系列超小型Web应用框架。 Hono 4.12.0版本至4.12.33版本存在资源管理错误漏洞，该漏洞源于languageDetector中间件处理特制语言标签时存在算法复杂度问题，可能导致未经身份验证的攻击者通过发送大量恶意请求造成CPU过度消耗，从而引发拒绝服务。

CVSS 5.3 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono >= 4.12.0, < 4.12.34 affected
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I. Basic Information for CVE-2026-71848

Vulnerability Information
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Vulnerability Title
Hono: Algorithmic Complexity DoS in Language Middleware
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.0 to 4.12.33, the languageDetector middleware is vulnerable to algorithmic complexity denial of service when processing a crafted language tag containing a large number of hyphen separated subtags. To implement progressive language tag truncation, normalizeLanguage() repeatedly calls parts.slice(0, i).join('-') for every possible prefix, so the total amount of string processing grows quadratically with the number of subtags. Language values may come from a query parameter, cookie, Accept-Language header, or URL path, depending on the detector configuration, and the default detector order enables query string, cookie, and header detection, so applications using languageDetector() may expose this processing to unauthenticated requests. An attacker may repeatedly send requests containing long, hyphen separated language tags, causing excessive CPU consumption and preventing unrelated requests from being processed. This issue is fixed in version 4.12.34.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono组织开源的一系列超小型Web应用框架。 Hono 4.12.0版本至4.12.33版本存在资源管理错误漏洞，该漏洞源于languageDetector中间件处理特制语言标签时存在算法复杂度问题，可能导致未经身份验证的攻击者通过发送大量恶意请求造成CPU过度消耗，从而引发拒绝服务。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono >= 4.12.0, < 4.12.34 -

II. Public POCs for CVE-2026-71848

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III. Intelligence Information for CVE-2026-71848

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Patches & Fixes for CVE-2026-71848 (1)

Vendor Advisories for CVE-2026-71848 (1)

Vendor Pages for CVE-2026-71848 (1)

Same Patch Batch · honojs · 2026-08-07 · 4 CVEs total

CVE-2026-69207 5.3 MEDIUM Hono: ReDoS in CORS middleware via Access-Control-Request-Headers
CVE-2026-71850 4.8 MEDIUM Hono: `memo()` retains SSR output across requests, leading to cross-user data disclosure
CVE-2026-71849 3.7 LOW Hono: Proxy Helper does not remove response headers listed in the `Connection` header

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-407

V. Comments for CVE-2026-71848

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