{"id":"CVE-2026-47675","title":"Hono is a Web application framework that provides support for any JavaScript runtime","summary":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the serialize() function in hono/cookie validates domain and path options against characters that corrupt Set-Cookie header syntax (;…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-113","CWE-1287"],"vendor":"hono","product":"hono","affected":["hono < 4.12.21"],"patched":["hono 4.12.21"],"published":"2026-05-28","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-47675","references":[{"url":"https://github.com/honojs/hono/security/advisories/GHSA-3hrh-pfw6-9m5x","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00216,"epssPercentile":0.11941,"ingestedAt":"2026-10-14T20:53:12.340Z","slug":"CVE-2026-47675","body":"## Overview\n\nHono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the serialize() function in hono/cookie validates domain and path options against characters that corrupt Set-Cookie header syntax (;, \\r, \\n), but does not apply the same validation to sameSite and priority. An application that passes user-controlled input into either option may produce a Set-Cookie response header containing attacker-chosen additional attributes. This vulnerability is fixed in 4.12.21.\n\n## Affected\n\n- `hono < 4.12.21`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `hono 4.12.21`","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}