How severe is CVE-2026-24473?

No CVSS score has been assigned to CVE-2026-24473 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-24473?

CVE-2026-24473 affects the following packages: hono (npm). Ecosystems affected: npm.

How do I fix CVE-2026-24473?

Update hono to 4.11.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-24473 is resolved across your whole dependency graph.

How do I detect CVE-2026-24473 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hono, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-24473 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2026-24473 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-24473 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-24473?

CVE-2026-24473 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 41th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-24473?

CVE-2026-24473 is classified as Information Exposure (CWE-200), CWE-284 (CWE-284), CWE-668 (CWE-668). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-24473 published, and has it been updated?

CVE-2026-24473 was published on January 27, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-24473 — hono

Fix: honojs/hono@cf9a78d

CVE-2026-24473 is a Information Exposure vulnerability in hono. A fix is available for hono — see the affected versions and patch details below.

Hono has an Arbitrary Key Read in Serve static Middleware (Cloudflare Workers Adapter)

Also known asGHSA-w332-q679-j88p

Published

Jan 27, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-24473.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk-0.00%

Lower risk than most CVEs41th percentile — riskier than 41% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

hononpm

104.5Mdownloads / week

Description

Summary

Serve static Middleware for the Cloudflare Workers adapter contains an information disclosure vulnerability that may allow attackers to read arbitrary keys from the Workers environment. Improper validation of user-controlled paths can result in unintended access to internal asset keys.

Details

The vulnerability exists in the serve-static middleware used with the Cloudflare Workers adapter. When serving static assets, the middleware does not sufficiently validate or restrict user-supplied paths before resolving them against the Workers asset storage.

As a result, an attacker may craft requests that access arbitrary keys beyond the intended static asset scope. This issue only affects applications running on Cloudflare Workers that use Serve static Middleware with user-controllable request paths.

Impact

This vulnerability may lead to information disclosure by allowing unauthorized access to internal assets or data stored in the Workers environment. The exposed data is limited to readable asset keys and does not allow modification of stored data or execution of arbitrary code.

The impact is limited to applications that use Serve static Middleware in the Cloudflare Workers adapter and rely on it to safely handle untrusted request paths.

Affected Components

Serve static Middleware (Cloudflare Workers adapter)

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`hono`	all versions	4.11.7`npm install hono@4.11.7`

Affected Products

1 product · 1 configurations

Application

honohono

< 4.11.7

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hono, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update hono to 4.11.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-24473 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

## Summary Serve static Middleware for the Cloudflare Workers adapter contains an information disclosure vulnerability that may allow attackers to read arbitrary keys from the Workers environment. Improper validation of user-controlled paths can result in unintended access to internal asset keys. ## Details The vulnerability exists in the serve-static middleware used with the Cloudflare Workers adapter. When serving static assets, the middleware does not sufficiently validate or restrict user-supplied paths before resolving them against the Workers asset storage. As a result, an attacker m

O3 Security · Impact-Aware SCA

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