{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-126359",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-11-10T21:12:01.228Z",
        "datePublished": "2026-11-12T22:22:32.161Z",
        "dateUpdated": "2026-11-12T22:22:32.161Z"
    },
    "containers": {
        "cna": {
            "title": "Hono: `css` helper does not escape a closing tag split between the template and an interpolated value, allowing HTML injection",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-79",
                            "lang": "en",
                            "description": "CWE-79: Improper Neutralization of Input During Web Page Generation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 3.4,
                        "baseSeverity": "LOW",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "CHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/honojs/hono/security/advisories/GHSA-3gg2-335m-rxc6",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/honojs/hono/security/advisories/GHSA-3gg2-335m-rxc6"
                },
                {
                    "name": "https://github.com/honojs/hono/commit/15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/honojs/hono/commit/15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513"
                },
                {
                    "name": "https://github.com/honojs/hono/releases/tag/v4.13.16",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/honojs/hono/releases/tag/v4.13.16"
                }
            ],
            "affected": [
                {
                    "vendor": "honojs",
                    "product": "hono",
                    "versions": [
                        {
                            "version": ">= 3.12.0, < 4.13.16",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-11-12T22:22:32.161Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 3.12.0 until 4.13.16, the css helper in hono/css escapes interpolated string values separately and therefore fails to neutralize a closing style tag when &lt; ends the template text or a preceding value and / begins the next attacker-controlled value. During server-side rendering, the combined output can close the &lt;Style /&gt; element early and cause the remainder of the interpolated value to be interpreted as HTML. Applications that place an untrusted string immediately after &lt; in a css template, including adjacent untrusted interpolations, can expose viewers to attacker-controlled HTML or script and information accessible to that page. Other uses of the css helper are not affected. This issue is fixed in version 4.13.16."
                }
            ],
            "source": {
                "advisory": "GHSA-3gg2-335m-rxc6",
                "discovery": "UNKNOWN"
            }
        }
    }
}