CVE-2026-59896: hono/jsx does not isolate context per request, leading to cross-request data disclosure

July 21, 2026

hono/jsx did not isolate context values per request during server-side rendering. While an async component was suspended on await, its provided context value stayed observable to other requests rendering concurrently, so useContext() could return a value from a different in-flight request.

References

github.com/advisories/GHSA-hvrm-45r6-mjfj
github.com/honojs/hono/commit/fab3b13639339cbd5ba1166a5b23d9ac30c5f64f
github.com/honojs/hono/releases/tag/v4.12.27
github.com/honojs/hono/security/advisories/GHSA-hvrm-45r6-mjfj
nvd.nist.gov/vuln/detail/CVE-2026-59896

Code Behaviors & Features

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