Hono CVE-2026-29085
MEDIUM
GHSA-p6xx-57qc-3wxr
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 10 npm packages depend on hono (10 direct, 0 indirect)
Ecosystem-wide dependent count for version 4.12.4.
DescriptionNVD
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.
AnalysisAI
Hono versions up to 4.12.4 contains a vulnerability that allows attackers to injection of additional SSE fields within the same event frame if untrusted inpu (CVSS 6.5).
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.
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External POC / Exploit Code
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