Hono cache middleware ignores "Cache-Control: private" leading to Web Cache Deception

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2026-24472: 0.52% estimated exploitation activity in the next 30 days; percentile 44.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Cache Middleware contains an information disclosure vulnerability caused by improper handling of HTTP cache control directives. The middleware does not respect standard cache control headers such as Cache-Control: private or Cache-Control: no-store, which may result in private or authenticated responses being cached and subsequently exposed to unauthorized users. Details The vulnerability exists in the cache decision logic of Cache Middleware. When determining whether a response should be cached, the middleware does not take HTTP cache control semantics into account and may cache responses that are explicitly marked as private by the application. While some runtimes, such as Cloudflare Workers, enforce cache control restrictions at the platform level, other runtimes including Deno, Bun, and Node.js rely on the middleware’s behavior. As a result, applications running on these runtimes may unintentionally cache sensitive responses. Impact This issue can lead to Web Cache…

Published by the source

27 Jan 2026, 19:04 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6wqw-2p9w-4vw4

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6wqw-2p9w-4vw4

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# Patch Next advisory brief: CVE-2026-24472

Advisory: Hono cache middleware ignores "Cache-Control: private" leading to Web Cache Deception
IDs: CVE-2026-24472, GHSA-6wqw-2p9w-4vw4
Record: https://patchnext.com/advisories/cve-2026-24472 (revision 2, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: hono 4.11.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm hono: affected < 4.11.7; fixed in 4.11.7

## Suggested inspection (read-only)
- `npm ls hono --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on hono.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6wqw-2p9w-4vw4 (OSV record GHSA-6wqw-2p9w-4vw4 lists affected ranges: npm hono >=0 <4.11.7 (fixed))
- Verified: https://github.com/advisories/GHSA-6wqw-2p9w-4vw4 (GitHub-reviewed advisory GHSA-6wqw-2p9w-4vw4 lists affected ranges: npm hono >=0 <4.11.7)

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