Hono: Cookie Attribute Injection via Unsanitized domain and path in setCookie()

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-29086 · CVE overview and exploitation status

EUVD-2026-9508

GHSA-5pq2-9x2x-5p6w

cve-program · CVE-2026-29086

• https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
• https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073

euvd · EUVD-2026-9508

• https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
• https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073

nvd · CVE-2026-29086

• https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
• https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w

osv · GHSA-5pq2-9x2x-5p6w

• https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
• https://nvd.nist.gov/vuln/detail/CVE-2026-29086
• https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
• https://github.com/honojs/hono

• Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, the setCookie() utility did not validate semicolons (;), carriage returns (\r), or newline characters (\n) in the domain and path… · Advisory content revised · 15 Nov 2026