{"id":"CVE-2026-126359","summary":"Hono: `css` helper does not escape a closing tag split between the template and an interpolated value, allowing HTML injection","details":"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 < 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 <Style /> element early and cause the remainder of the interpolated value to be interpreted as HTML. Applications that place an untrusted string immediately after < 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.","aliases":["GHSA-3gg2-335m-rxc6"],"modified":"2026-11-13T10:46:28.924481422Z","published":"2026-11-12T22:22:32.161Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126359.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126359.json"},{"type":"FIX","url":"https://github.com/honojs/hono/commit/15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513"},{"type":"WEB","url":"https://github.com/honojs/hono/releases/tag/v4.13.16"},{"type":"ADVISORY","url":"https://github.com/honojs/hono/security/advisories/GHSA-3gg2-335m-rxc6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126359"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/honojs/hono","events":[{"introduced":"3f8d1ea5116dcf81e054f4d6a9b7a4e6ef833cd9"},{"fixed":"c91b60a251186fb024557c6d55a11d8e388f179c"},{"fixed":"15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"3.12.0"},{"fixed":"4.13.16"}],"source":"AFFECTED_FIELD"},{"range":[{"fixed":"15bbd96ad1b62a0b189db4fd8dc7bf8ef280c513"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_TAG","original_tag":"v4.13.16","range":[{"fixed":"c91b60a251186fb024557c6d55a11d8e388f179c"}]}]}}],"versions":["v4.13.15","v4.13.14","@hono/vercel@1.0.1","@hono/service-worker@1.0.1","@hono/netlify@1.0.2","@hono/lambda-edge@1.0.1","@hono/deno@1.0.3","@hono/cloudflare-workers@1.0.1","@hono/bun@1.0.1","@hono/aws-lambda@1.0.1","v4.13.13","v4.13.12","v4.13.11","@hono/netlify@1.0.1","@hono/deno@1.0.2","@hono/deno@1.0.1","v4.13.10","v4.13.9","v4.13.8","v4.13.7","v4.13.6","v4.13.5","v4.13.4","v4.13.3","v4.13.2","v4.13.1","v4.13.0","v4.12.34","v4.12.33","v4.12.32","v4.12.31","v4.12.30","v4.12.29","v4.12.28","v4.12.27","v4.12.26","v4.12.25","v4.12.24","v4.12.23","v4.12.22","v4.12.21","v4.12.20","v4.12.19","v4.12.18","v4.12.17","v4.12.16","v4.12.15","v4.12.14","v4.12.13","v4.12.12","v4.12.11","v4.12.10","v4.12.9","v4.12.8","v4.12.7","v4.12.6","v4.12.5","v4.12.4","v4.12.3","v4.12.2","v4.12.1","v4.12.0","v4.11.10","v4.11.9","v4.11.8","v4.11.7","v4.11.6","v4.11.5","v4.11.4","v4.11.3","v4.11.2","v4.11.1","v4.11.0","v4.10.8","v4.10.7","v4.10.6","v4.10.5","v4.10.4","v4.10.3","v4.10.2","v4.10.1","v4.10.0","v4.9.12","v4.9.11","v4.9.10","v4.9.9","v4.9.8","v4.9.7","v4.9.6","v4.9.5","v4.9.4","v4.9.3","v4.9.2","v4.9.1","v4.9.0","v4.8.12","v4.8.11","v4.8.10","v4.8.9","v4.8.8","v4.8.7","v4.8.6","v4.8.5","v4.8.4","v4.8.3","v4.8.2","v4.8.1","v4.8.0","v4.7.11","v4.7.10","v4.7.9","v4.7.8","v4.7.7","v4.7.6","v4.7.5","v4.7.4","v4.7.3","v4.7.2","v4.7.1","v4.7.0","v4.6.20","v4.6.19","v4.6.18","v4.6.17","v4.6.16","v4.6.15","v4.6.14","v4.6.13","v4.6.12","v4.6.11","v4.6.10","v4.6.9","v4.6.8","v4.6.7","v4.6.6","v4.6.5","v4.6.4","v4.6.3","v4.6.2","v4.6.1","v4.6.0","v4.5.11","v4.5.10","v4.5.9","v4.5.8","v4.5.7","v4.5.6","v4.5.5","v4.5.4","v4.5.3","v4.5.2","v4.5.1","v4.5.0","v4.4.13","v4.4.12","v4.4.11","v4.4.10","v4.5.0-rc.2","v4.4.9","v4.4.8","v4.4.7","v4.4.6","v4.5.0-rc.1","v4.4.5","v4.4.4","v4.4.3","v4.4.2","v4.4.1","v4.4.0","v4.3.11","v4.3.10","v4.3.9","v4.3.8","v4.3.7","v4.3.6","v4.3.5","v4.3.4","v4.3.3","v4.3.2","v4.3.1","v4.3.0","v4.2.9","v4.2.8","v4.2.7","v4.2.6","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.10","v4.1.0-rc.1","v4.0.9","v4.0.8","v4.0.7","v4.0.6","v4.0.5","v4.0.4","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.12.12","v3.12.11","v3.12.10","v3.12.9","v4.0.0-rc.3","v3.12.8","v3.12.7","v4.0.0-rc.2","v3.12.6","v4.0.0-rc.1","v3.12.5","v3.12.4","v3.12.3","v3.12.2","v4.0.0-rc.0","v3.12.1","v3.12.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126359.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N"}]}