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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.12.4)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "hono", "source": "cna", "vendor": "honojs"}, "product": "hono", "vendor": "hono"}], "analysis": {"en": {"generated_at": "2026-04-17T13:01:06.691638+00:00", "value": {"mitigation_remediation": ["Upgrade Hono to version 4.12.4 or later to apply the patched URL\u2011decoding logic.", "Reconfigure or remove serveStatic usage where route\u2011based authentication is applied, or switch to a static file handler that correctly aligns decoding behavior with the router.", "If upgrading immediately is not feasible, replace serveStatic with an alternative that enforces strict path normalization or explicitly validates and rejects encoded slashes before file resolution."], "summary": {"action": "Apply Patch", "impact": "Arbitrary File Access"}, "threat_synthesis": {"affected_systems": "Hono framework (honojs:hono) versions earlier than 4.12.4 are impacted. The issue exists in any JavaScript runtime that runs Hono and configures serveStatic in combination with route\u2011based middleware such as app.use('/admin/*', ...) for protecting static content.", "description_and_impact": "The vulnerability in Hono\u2019s serveStatic middleware is an inconsistent encoding flaw (CWE\u2011177) that allows attackers to read protected static files. Hono\u2019s router uses decodeURI while serveStatic uses decodeURIComponent, so request paths containing encoded slashes (%2F) can bypass route\u2011based middleware protections. Exploiting this mismatch grants unauthorized read access to filesystem resources, leading to disclosure of sensitive data.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity, but the EPSS score of less than 1% suggests a low probability of exploitation at this time. The vulnerability is not listed in the CISA KEV catalog, implying no known widespread exploitation. The likely attack vector is remote, delivered via crafted HTTP requests that target the web application\u2019s static file endpoints. Exploitation requires prior deployment of Hono with serveStatic configured and route\u2011based middleware; no additional access or privileges are necessary. The risk remains moderate to high until the issue is fixed by upgrading the framework."}}}}, "created": "2026-03-05T09:05:36.392980+00:00", "updated": "2026-04-17T13:15:19.647247+00:00", "vendors": ["hono", "hono$PRODUCT$hono"]}