{"schemaVersion":3,"id":"CVE-2026-109955","aliases":["RHSA-2026:84422","RHSA-2026:84423","RHSA-2026:84431","GHSA-5r4p-p66f-jhc7","CVE-2026-111757"],"status":"published","duplicateOf":null,"title":null,"description":"Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.","dates":{"published":"2026-10-19T17:31:20.341Z","modified":"2026-10-20T16:10:30.638Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Red 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Decoding of the Same Data","description":"The product decodes the same input twice, which can limit the effectiveness of any protection mechanism that occurs in between the decoding operations.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/174.html"}],"affected":[{"vendor":"honojs","product":"hono","name":"hono","label":"hono","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.12.4, < 4.13.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.12.4, < 4.13.11","eol":null,"hubHref":"/vendor/honojs/hono"},{"vendor":"Npm","product":"hono","name":"hono","label":"hono","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/hono","purlType":"npm","versions":[{"text":"≥ 4.12.4, < 4.13.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.12.4, < 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0:13.2.3-0.2.hum1","eol":null,"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7","label":"github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7","hostname":"github.com","tags":["Vendor Advisory","ARTICLE","WEB","X Refsource CONFIRM"]},{"url":"https://www.vulncheck.com/advisories/hono-4.12.4-before-4.13.11-middleware-bypass-via-servestatic-double-decoding","label":"www.vulncheck.com/advisories/…","hostname":"www.vulncheck.com","tags":["Third Party 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