CVE-2026-27700

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Source
https://cve.org/CVERecord?id=CVE-2026-27700
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27700.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-27700
Aliases
Downstream
CGA (4)
Published
2026-02-25T15:01:44Z
Modified
2026-10-21T02:30:54Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
Summary
Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-290",
        "CWE-345"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27700.json"
}
References

Affected packages

Git / github.com/honojs/hono

Affected ranges

Type
GIT
Repo
https://github.com/honojs/hono
Events
Introduced
d2ed2e9c966d82e2369bd74bdae4acd4e8f57807
Fixed
df97e5f49771a2a219770515859b9cc1d80abab0
Fixed
41adbf56e252c04611f8972364ac0887ae07a4c7
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "4.12.0"
                },
                {
                    "fixed":  "4.12.2"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "41adbf56e252c04611f8972364ac0887ae07a4c7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v4.12.2",
            "range":  [
                {
                    "fixed":  "df97e5f49771a2a219770515859b9cc1d80abab0"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v4.*
v4.12.0
v4.12.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27700.json"