CVE-2026-39409

MEDIUM EPSS 26.1%
Published Apr 8, 20262mo ago · Modified Jun 17, 20262w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Apr 8, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
26.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-180

Affected Products 1

VendorProductVersionRange
honohono* ≤4.12.11

References 3

  • github.com https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
    Patch
  • github.com https://github.com/honojs/hono/releases/tag/v4.12.12
    Release Notes
  • github.com https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
    Vendor Advisory

Remediation

  • github.com https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
    Patch