CVE-2026-29085

MEDIUM EPSS 15.0%
Published Mar 4, 20264mo ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Mar 4, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.5
Exploitability
3.9
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
15.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-74

Affected Products 1

VendorProductVersionRange
honohono* <4.12.4

References 2

  • github.com https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
    Patch
  • github.com https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
    Vendor Advisory

Remediation

  • github.com https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
    Patch