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CVE-2026-44457— Hono: Cache Middleware ignores Vary: Authorization / Vary: Cookie leading to cross-user cache leakage

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 4.12.18之前版本存在安全漏洞，该漏洞源于缓存中间件未跳过对声明每用户差异的响应的缓存，可能导致一个已认证用户的缓存响应被提供给后续不同用户的请求。

CVSS 5.3 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.18 affected
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I. Basic Information for CVE-2026-44457

Vulnerability Information
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Vulnerability Title
Hono: Cache Middleware ignores Vary: Authorization / Vary: Cookie leading to cross-user cache leakage
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, Cache Middleware does not skip caching for responses that declare per-user variance via Vary: Authorization or Vary: Cookie. As a result, a response cached for one authenticated user may be served to subsequent requests from different users. This vulnerability is fixed in 4.12.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过缓存导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 安全漏洞
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 4.12.18之前版本存在安全漏洞，该漏洞源于缓存中间件未跳过对声明每用户差异的响应的缓存，可能导致一个已认证用户的缓存响应被提供给后续不同用户的请求。
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 < 4.12.18 -

II. Public POCs for CVE-2026-44457

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III. Intelligence Information for CVE-2026-44457

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Vendor Advisories for CVE-2026-44457 (1)

Same Patch Batch · honojs · 2026-05-13 · 5 CVEs total

CVE-2026-44456 6.5 MEDIUM Hono: bodyLimit() can be bypassed for chunked / unknown-length requests
CVE-2026-44455 4.7 MEDIUM Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection
CVE-2026-44458 4.3 MEDIUM Hono: CSS Declaration Injection via Style Object Values in JSX SSR
CVE-2026-44459 3.8 LOW Hono: Improper validation of NumericDate claims (exp, nbf, iat) in JWT verify()

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-524

V. Comments for CVE-2026-44457

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