CVE-2026-71850

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71850", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-07T18:26:53.523Z", "datePublished": "2026-08-07T18:41:17.068Z", "dateUpdated": "2026-08-10T13:26:55.984Z"}, "containers": {"cna": {"title": "Hono: `memo()` retains SSR output across requests, leading to cross-user data disclosure", "problemTypes": [{"descriptions": [{"cweId": "CWE-488", "lang": "en", "description": "CWE-488: Exposure of Data Element to Wrong Session", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r"}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"version": ">= 3.8.0, < 4.12.34", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-07T18:41:17.068Z"}, "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 3.8.0 to 4.12.33, memo() from hono/jsx retains the result of a server side render and reuses it for later renders with comparator equal props, and request scoped values read inside the component take no part in that comparison, so a response can contain HTML rendered for another user's request. Components wrapped with memo() are compared by props alone; values read implicitly during rendering, such as JSX Context through createContext() and useContext(), useRequestContext() from hono/jsx-renderer, and getContext() from hono/context-storage, do not participate, and the retained result lives as long as the wrapped component, so it outlives the request that produced it. A user may receive a response containing HTML rendered for another user when both render the same memoized component with comparator equal props on the same warm instance, which may disclose another user's account or profile data, disclose request scoped secrets embedded in HTML such as CSRF tokens, or expose role specific content to users who should not receive it. This issue is fixed in version 4.12.34."}], "source": {"advisory": "GHSA-f23p-vx2j-j53r", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-10T13:26:46.686577Z", "id": "CVE-2026-71850", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-10T13:26:55.984Z"}}]}}

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{"affected": [{"affectedData": [{"product": "hono", "vendor": "honojs", "versions": [{"status": "affected", "version": ">= 3.8.0, < 4.12.34"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 3.8.0 to 4.12.33, memo() from hono/jsx retains the result of a server side render and reuses it for later renders with comparator equal props, and request scoped values read inside the component take no part in that comparison, so a response can contain HTML rendered for another user's request. Components wrapped with memo() are compared by props alone; values read implicitly during rendering, such as JSX Context through createContext() and useContext(), useRequestContext() from hono/jsx-renderer, and getContext() from hono/context-storage, do not participate, and the retained result lives as long as the wrapped component, so it outlives the request that produced it. A user may receive a response containing HTML rendered for another user when both render the same memoized component with comparator equal props on the same warm instance, which may disclose another user's account or profile data, disclose request scoped secrets embedded in HTML such as CSRF tokens, or expose role specific content to users who should not receive it. This issue is fixed in version 4.12.34."}, {"lang": "es", "value": "Hono es un framework de aplicaci\u00f3n web que proporciona soporte para cualquier entorno de ejecuci\u00f3n de JavaScript. Desde la versi\u00f3n 3.8.0 hasta la 4.12.33, memo() de hono/jsx retiene el resultado de una renderizaci\u00f3n del lado del servidor y lo reutiliza para renderizaciones posteriores con props iguales al comparador, y los valores con alcance de solicitud le\u00eddos dentro del componente no participan en esa comparaci\u00f3n, por lo que una respuesta puede contener HTML renderizado para la solicitud de otro usuario. Los componentes envueltos con memo() se comparan solo por sus props; los valores le\u00eddos impl\u00edcitamente durante la renderizaci\u00f3n, como el Contexto JSX a trav\u00e9s de createContext() y useContext(), useRequestContext() de hono/jsx-renderer, y getContext() de hono/context-storage, no participan, y el resultado retenido vive tanto como el componente envuelto, por lo que sobrevive a la solicitud que lo produjo. Un usuario puede recibir una respuesta que contenga HTML renderizado para otro usuario cuando ambos renderizan el mismo componente memoizado con props iguales al comparador en la misma instancia \u201cwarm\u201d, lo que puede divulgar los datos de cuenta o perfil de otro usuario, divulgar secretos con alcance de solicitud incrustados en HTML como tokens CSRF, o exponer contenido espec\u00edfico de rol a usuarios que no deber\u00edan recibirlo. Este problema est\u00e1 solucionado en la versi\u00f3n 4.12.34."}], "id": "CVE-2026-71850", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71850", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-10T13:26:46.686577Z", "version": "2.0.3"}}]}, "published": "2026-08-07T19:18:54.240", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-488"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.8.0,4.12.34)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "hono", "source": "cna", "vendor": "honojs"}, "product": "hono", "vendor": "hono"}], "created": "2026-08-07T20:45:03.374175+00:00", "updated": "2026-08-08T20:45:17.020413+00:00", "vendors": ["hono", "hono$PRODUCT$hono"]}