CVE-2026-47675: medium-severity vulnerability in honojs hono
Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.3epss 0.2%
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 (;, \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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Affected products
honojs · honoRelated CVEs — honojs hono
In the same product, most dangerous first.
CVE-2024-32869MEDIUMHono vulnerable to Restricted Directory Traversal in serveStatic with denoEPSS 0.6%CVE-2023-50710MEDIUMHono's named path parameters can be overridden in TrieRouterEPSS 0.6%CVE-2026-69207MEDIUMHono: ReDoS in CORS middleware via Access-Control-Request-HeadersEPSS 0.6%CVE-2026-29045HIGHHono: Arbitrary file access via serveStatic vulnerabilityEPSS 0.6%CVE-2025-58362HIGHHono contains a flaw in URL path parsing, potentially leading to path confusionEPSS 0.6%CVE-2026-84364MEDIUMHono: Unbounded dot-notation nesting in `parseBody()` can cause memory exhaustionEPSS 0.5%