{"action":"Upgrade hono to 4.12.12 or later.","affected":[{"fixed":"4.12.12","introduced":"0"}],"component":"hono","cve_ids":["CVE-2026-39409"],"ecosystem":"npm","epss":0.00343,"exploited":false,"fixed_versions":["4.12.12"],"ghsa_id":"GHSA-xpcf-pg52-r92g","id":"tcs_01M5KGJFXT39WE9J56277YVGA3","modified_at":"2026-09-10T03:50:44.898181069Z","published_at":"2026-04-08T00:17:14Z","references":["https://osv.dev/vulnerability/GHSA-xpcf-pg52-r92g","https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g","https://nvd.nist.gov/vuln/detail/CVE-2026-39409","https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.12"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-xpcf-pg52-r92g","url":"https://osv.dev/vulnerability/GHSA-xpcf-pg52-r92g"}],"summary":"Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses"}