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CVE-2026-29085— Hono: SSE Control Field Injection via CR/LF in writeSSE()

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 4.12.4之前版本存在注入漏洞，该漏洞源于streamSSE函数未验证事件、ID和重试字段中的回车或换行符，可能导致在SSE事件帧中注入额外的SSE字段。

CVSS 6.5 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2026-29085

Vulnerability Information
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Vulnerability Title
Hono: SSE Control Field Injection via CR/LF in writeSSE()
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using streamSSE() in Streaming Helper, the event, id, and retry fields were not validated for carriage return (\r) or newline (\n) characters. Because the SSE protocol uses line breaks as field delimiters, this could allow injection of additional SSE fields within the same event frame if untrusted input was passed into these fields. This issue has been patched in version 4.12.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 注入漏洞
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 4.12.4之前版本存在注入漏洞，该漏洞源于streamSSE函数未验证事件、ID和重试字段中的回车或换行符，可能导致在SSE事件帧中注入额外的SSE字段。
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 < 4.12.4 -

II. Public POCs for CVE-2026-29085

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III. Intelligence Information for CVE-2026-29085

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Patches & Fixes for CVE-2026-29085 (1)

Vendor Advisories for CVE-2026-29085 (1)

Same Patch Batch · honojs · 2026-03-04 · 3 CVEs total

CVE-2026-29045 7.5 HIGH Hono: Arbitrary file access via serveStatic vulnerability
CVE-2026-29086 5.4 MEDIUM Hono: Cookie Attribute Injection via Unsanitized domain and path in setCookie()

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-74

V. Comments for CVE-2026-29085

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