{"id":"GHSA-2gcr-mfcq-wcc3","revision":null,"records":[{"revision":"e8ac4ad9318748a4889deab77fcd02f8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-47676","aliases":[],"title":"Hono: app.mount() strips mount prefix using undecoded path, causing incorrect routing for percent-encoded paths","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in the mounted sub-application receiving an incorrect path. This vulnerability is fixed in 4.12.21.","state":0,"publishedAt":"2026-05-28T15:26:01.672+00:00","modifiedAt":"2026-05-28T19:13:28.934+00:00","affected":[{"ecosystem":"Vendor product","name":"hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"honojs\",\n                    \"product\": \"hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.12.21\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-2gcr-mfcq-wcc3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-47676","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-47676","identifiers":["CVE-2026-47676"]},"retained":false,"historicalAffected":[]},{"revision":"53d7cfbc102b49ff9f39c8110d921608","observedAt":"2026-11-09T12:02:53.648+00:00","statement":{"source":"euvd","id":"EUVD-2026-32924","aliases":["CVE-2026-47676","GHSA-2gcr-mfcq-wcc3"],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. 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This vulnerability is fixed in 4.12.21.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-2gcr-mfcq-wcc3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-32924","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 28, 2026, 3:26:01 PM","dateUpdated":"May 28, 2026, 7:13:28 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in the mounted sub-application receiving an incorrect path.\n\n### Details\n\nWhen `app.mount(prefix, subApp)` is called, Hono calculates the number of characters to strip based on the decoded mount prefix length, but then applies that slice to the raw URL pathname. When the URL contains percent-encoded characters that expand to fewer characters when decoded (such as encoded non-ASCII characters), the two representations have different lengths, so the prefix is stripped at the wrong byte offset.\n\nAs a result, the sub-application receives a path that does not correspond to the intended sub-path — it may receive a partial or garbled path instead of the expected value after the mount prefix is removed.\n\nThis issue arises when an application uses `app.mount()` with paths that contain percent-encoded characters, particularly when the mount prefix itself or the request path contains encoded non-ASCII characters.\n\n### Impact\n\nA mounted sub-application may receive an incorrectly stripped path, causing requests to be routed to unintended handlers within the sub-application.\n\nThis may lead to:\n\n- Middleware or route handlers in the sub-application being bypassed or incorrectly matched due to the malformed path\n- Requests reaching sub-application routes that the developer did not intend to be accessible via the mounted path\n\nThis issue affects applications that use `app.mount()` where the request URL may contain percent-encoded characters in the mount prefix or subsequent path segments.","state":0,"publishedAt":"2026-06-04T18:01:00+00:00","modifiedAt":"2026-09-10T03:51:07.5547532+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.12.21"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-2gcr-mfcq-wcc3","https://nvd.nist.gov/vuln/detail/CVE-2026-47676","https://github.com/honojs/hono/commit/6cbb025ff87fca1a3d00d0ccca0eaf3a6385c3f1","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.21"],"sourceUrl":"https://github.com/advisories/GHSA-2gcr-mfcq-wcc3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2gcr-mfcq-wcc3","identifiers":["GHSA-2gcr-mfcq-wcc3","CVE-2026-47676"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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