Vulnerability-Lookup

CVE-2026-47674 (GCVE-0-2026-47674)

Vulnerability from cvelistv5 – Published: 2026-05-28 15:29 – Updated: 2026-06-02 18:15

Title

Hono: IP Restriction bypasses static deny rules for non-canonical IPv6

Summary

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-02 18:14 UTC

CWE

CWE-185 - Incorrect Regular Expression
CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/honojs/hono/security/advisorie…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
honojs	hono	Affected: < 4.12.21	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-47674

Vulnerability from fkie_nvd - Published: 2026-05-28 17:16 - Updated: 2026-10-14 20:10

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5	Vendor Advisory

Impacted products

	Vendor	Product	Version
	hono	hono	*

JSON

To clipboard

{
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      "affectedData": [
        {
          "product": "hono",
          "vendor": "honojs",
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GHSA-XRHX-7G5J-RCJ5

Vulnerability from github – Published: 2026-06-04 18:00 – Updated: 2026-06-04 18:00

Summary

Hono: IP Restriction bypasses static deny rules for non-canonical IPv6

Details

Summary

The ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped.

Details

When the rule matcher is built, each configured IP rule is normalized to a canonical string form. Incoming IP addresses received at request time are then compared against those canonical strings without applying the same normalization. Because IPv6 permits multiple syntactically different representations of the same numeric address, a non-canonical form of a denied address fails the string lookup and proceeds to the CIDR check, which also finds no match for rules registered as static (no prefix length). The request is then allowed.

Affected non-canonical forms include:

Compressed versus expanded notation (2001:db8::1 vs 2001:db8:0:0:0:0:0:1)
Hex-notation IPv4-mapped addresses (::ffff:7f00:1 vs ::ffff:127.0.0.1)
Zone identifier suffixes (e.g., fe80::1%eth0)

Additionally, invalid IP address strings provided as the remote address are not rejected and may result in unexpected allow or deny behavior.

This issue arises when applications use ipRestriction() with static (non-CIDR) rules and the IP address source can supply addresses in non-canonical IPv6 form.

Impact

A request from an IP address covered by a static deny rule may bypass the restriction if the address is presented in a non-canonical IPv6 form.

This may lead to:

Unauthorized access to endpoints intended to be restricted to specific IP addresses
Bypass of IP-based access controls in environments where the runtime or an upstream proxy provides source addresses in a form that differs from the canonical form used in the rule configuration

This issue affects applications using hono/ip-restriction with static deny rules for IPv4 or IPv6 addresses, particularly when the source address is derived from proxy headers or custom getIP implementations that may return non-canonical forms.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Show details on source website

JSON

To clipboard

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    "nvd_published_at": "2026-05-28T17:16:32Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe `ip-restriction` middleware (`hono/ip-restriction`) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule \u2014 such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses \u2014 do not match the normalized rule entry, causing the rule to be silently skipped.\n\n### Details\n\nWhen the rule matcher is built, each configured IP rule is normalized to a canonical string form. Incoming IP addresses received at request time are then compared against those canonical strings without applying the same normalization. Because IPv6 permits multiple syntactically different representations of the same numeric address, a non-canonical form of a denied address fails the string lookup and proceeds to the CIDR check, which also finds no match for rules registered as static (no prefix length). The request is then allowed.\n\nAffected non-canonical forms include:\n\n- Compressed versus expanded notation (`2001:db8::1` vs `2001:db8:0:0:0:0:0:1`)\n- Hex-notation IPv4-mapped addresses (`::ffff:7f00:1` vs `::ffff:127.0.0.1`)\n- Zone identifier suffixes (e.g., `fe80::1%eth0`)\n\nAdditionally, invalid IP address strings provided as the remote address are not rejected and may result in unexpected allow or deny behavior.\n\nThis issue arises when applications use `ipRestriction()` with static (non-CIDR) rules and the IP address source can supply addresses in non-canonical IPv6 form.\n\n### Impact\n\nA request from an IP address covered by a static deny rule may bypass the restriction if the address is presented in a non-canonical IPv6 form.\n\nThis may lead to:\n\n- Unauthorized access to endpoints intended to be restricted to specific IP addresses\n- Bypass of IP-based access controls in environments where the runtime or an upstream proxy provides source addresses in a form that differs from the canonical form used in the rule configuration\n\nThis issue affects applications using `hono/ip-restriction` with static deny rules for IPv4 or IPv6 addresses, particularly when the source address is derived from proxy headers or custom `getIP` implementations that may return non-canonical forms.",
  "id": "GHSA-xrhx-7g5j-rcj5",
  "modified": "2026-06-04T18:00:22Z",
  "published": "2026-06-04T18:00:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47674"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/commit/c831020fb1fa2e929d222f6c84e1abfe013e512b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/releases/tag/v4.12.21"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hono: IP Restriction bypasses static deny rules for non-canonical IPv6 "
}

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CVE-2026-47674 (GCVE-0-2026-47674)

FKIE_CVE-2026-47674

GHSA-XRHX-7G5J-RCJ5

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