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As a result, both names are normalized to:\n\n```\n\"dummy-cookie\"\n```\n\nThis mismatch allows attacker-controlled cookies with a `U+00A0` prefix to shadow or override legitimate cookies when accessed via `getCookie()`.\n\n## Impact\n\nAn attacker who can set cookies (e.g., via a man-in-the-middle on a non-secure page or other injection vector) can bypass cookie prefix protections and override sensitive cookies.\n\nThis may lead to:\n\n* Bypassing `__Secure-` and `__Host-` prefix protections\n* Overriding cookies that rely on the Secure attribute\n* Session fixation or session hijacking depending on application usage\n\nThis issue affects applications that rely on `getCookie()` for security-sensitive cookie handling.","state":0,"publishedAt":"2026-04-08T00:17:21+00:00","modifiedAt":"2026-09-10T03:51:02.8627415+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.12.12"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4","https://nvd.nist.gov/vuln/detail/CVE-2026-39410","https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.12"],"sourceUrl":"https://github.com/advisories/GHSA-r5rp-j6wh-rvv4","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-r5rp-j6wh-rvv4","identifiers":["GHSA-r5rp-j6wh-rvv4","CVE-2026-39410"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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