Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity race condition in hono from honojs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 77.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.11.8 before 4.12.27, hono/jsx did not isolate context values per request during server-side rendering, allowing createContext, useContext, jsxRenderer, or useRequestContext data from a different in-flight request to be used after an await in an async component. This issue is fixed in version 4.12.27.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	hono	4.12.27	GHSA-hvrm-45r6-mjfj

Affected products (as reported)

Vendor	Product	Versions
honojs	hono	>= 4.11.8, < 4.12.27

Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

References

https://github.com/honojs/hono/security/advisories/GHSA-hvrm-45r6-mjfj x_refsource_CONFIRM
https://github.com/honojs/hono/commit/fab3b13639339cbd5ba1166a5b23d9ac30c5f64f x_refsource_MISC
https://github.com/honojs/hono/releases/tag/v4.12.27 x_refsource_MISC