CVE-2026-27700 (GCVE-0-2026-27700)

Vulnerability from cvelistv5 – Published: 2026-02-25 15:01 – Updated: 2026-02-25 15:01
VLAI?
Title
Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.
Severity ?
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
References
Impacted products
Vendor Product Version
honojs hono Affected: >= 4.12.0, < 4.12.2
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          "vendor": "honojs",
          "versions": [
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        }
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              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
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              "description": "CWE-290: Authentication Bypass by Spoofing",
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      "providerMetadata": {
        "dateUpdated": "2026-02-25T15:01:44.681Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          "url": "https://github.com/honojs/hono/releases/tag/v4.12.2"
        }
      ],
      "source": {
        "advisory": "GHSA-xh87-mx6m-69f3",
        "discovery": "UNKNOWN"
      },
      "title": "Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo"
    }
  },
  "cveMetadata": {
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    "datePublished": "2026-02-25T15:01:44.681Z",
    "dateReserved": "2026-02-23T17:56:51.202Z",
    "dateUpdated": "2026-02-25T15:01:44.681Z",
    "state": "PUBLISHED"
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  }
}


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