{"id":"CVE-2026-71850","revision":null,"records":[{"revision":"2fef49279c874d3faf3a7e94f0fcf757","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-71850","aliases":[],"title":"Hono: `memo()` retains SSR output across requests, leading to cross-user data disclosure","description":"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.","state":0,"publishedAt":"2026-08-07T18:41:17.068+00:00","modifiedAt":"2026-08-10T13:26:55.984+00:00","affected":[{"ecosystem":"Vendor product","name":"hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"honojs\",\n                    \"product\": \"hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 3.8.0, < 4.12.34\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-71850","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-71850","identifiers":["CVE-2026-71850"]},"retained":false,"historicalAffected":[]},{"revision":"cdbff0de26904ba5b69e05af66a750ae","observedAt":"2026-10-25T15:19:03.401+00:00","statement":{"source":"nvd","id":"CVE-2026-71850","aliases":[],"title":"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 re…","description":"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.","state":0,"publishedAt":"2026-08-07T19:18:54.24+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71850","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-488"],"productCriteria":[],"sourceDates":{"published":"2026-08-07T19:18:54.240","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-71850","identifiers":["CVE-2026-71850"]},"retained":false,"historicalAffected":[]},{"revision":"1dacb471c502497baded02c1fdfcebd8","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-f23p-vx2j-j53r","aliases":["CVE-2026-71850"],"title":"Hono: `memo()` retains SSR output across requests, leading to cross-user data disclosure","description":"### Summary\n\n`memo()` from `hono/jsx` retains the result of a server-side render and reuses it for later renders with comparator-equal props. 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.\n\n### Details\n\nComponents wrapped with `memo()` are compared by props alone. Values read implicitly during rendering do not participate: JSX Context through `createContext()` and `useContext()`, `useRequestContext()` from `hono/jsx-renderer`, and `getContext()` from `hono/context-storage`. The retained result lives as long as the wrapped component, so it outlives the request that produced it.\n\nPer-request context isolation is not what fails: the current request's values are established correctly, but the memoized component is skipped before anything reads them.\n\nThis issue arises when a component wrapped in `memo()` obtains user- or request-specific data from an ambient context instead of through props.\n\n### Impact\n\nA 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.\n\nThis may lead to:\n\n- Disclosure of another user's account or profile data\n- Disclosure of request-scoped secrets embedded in HTML, such as CSRF tokens\n- Exposure of role-specific content to users who should not receive it\n\nExploitation depends on the order in which renders populate the retained value and on both requests reaching the same warm instance.\n\nThis issue affects applications that render with `hono/jsx` on the server and wrap a component reading ambient request state in `memo()`. Applications that pass all request-specific values through props, or that do not use `memo()`, are unaffected. Client-side rendering is unaffected.","state":0,"publishedAt":"2026-08-07T18:42:01+00:00","modifiedAt":"2026-09-10T03:51:13.947851+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.8.0"},{"kind":"fixed","version":"4.12.34"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/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-f23p-vx2j-j53r","https://github.com/honojs/hono/commit/0c45036d6b0ddf42ab2fa44639dc8710825d5c0f","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.34"],"sourceUrl":"https://github.com/advisories/GHSA-f23p-vx2j-j53r","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-f23p-vx2j-j53r","identifiers":["GHSA-f23p-vx2j-j53r","CVE-2026-71850"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-25T22:04:11.413428+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":4764,"expectedIdentifiers":13474},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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