{"api_version":"1","generated_at":"2026-11-13T01:07:56+00:00","cve":"CVE-2026-126359","urls":{"html":"https://cve.report/CVE-2026-126359","api":"https://cve.report/api/cve/CVE-2026-126359.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-126359","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-126359"},"summary":{"title":"Hono: `css` helper does not escape a closing tag split between the template and an interpolated value, allowing HTML injection","description":"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.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-11-13 00:20:11","updated_at":"2026-11-13 00:20:11"},"problem_types":["CWE-79","CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"3.4","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N","baseScore":3.4,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"3.4","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N","data":{"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":[{"url":"https://github.com/honojs/hono/releases/tag/v4.13.16","name":"https://github.com/honojs/hono/releases/tag/v4.13.16","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/honojs/hono/security/advisories/GHSA-3gg2-335m-rxc6","name":"https://github.com/honojs/hono/security/advisories/GHSA-3gg2-335m-rxc6","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/honojs/hono/commit/15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513","name":"https://github.com/honojs/hono/commit/15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-126359","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126359","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"honojs","product":"hono","version":"affected >= 3.12.0, < 4.13.16","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"hono","vendor":"honojs","versions":[{"status":"affected","version":">= 3.12.0, < 4.13.16"}]}],"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."}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-12T22:22:32.161Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"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"}],"source":{"advisory":"GHSA-3gg2-335m-rxc6","discovery":"UNKNOWN"},"title":"Hono: `css` helper does not escape a closing tag split between the template and an interpolated value, allowing HTML injection"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-126359","datePublished":"2026-11-12T22:22:32.161Z","dateReserved":"2026-11-10T21:12:01.228Z","dateUpdated":"2026-11-12T22:22:32.161Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-13 00:20:11","lastModifiedDate":"2026-11-13 00:20:11","problem_types":["CWE-79","CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N","baseScore":3.4,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.6,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"126359","Ordinal":"1","Title":"Hono: `css` helper does not escape a closing tag split between t","CVE":"CVE-2026-126359","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"126359","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Hono: `css` helper does not escape a closing tag split between t"}]}}}