Is CVE-2026-93981 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-93981 being exploited in the wild.

How severe is CVE-2026-93981?

Medium severity, with a CVSS score of 4.7, published 19 September 2026.

Which products and versions are affected?

Hono before 4.13.7; hono (npm) < 4.13.7, SEMVER:introduced=0,fixed=4.13.7.

Is there a fix for CVE-2026-93981?

Yes. hono (npm): upgrade to 4.13.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-93981 attacked?

It is attacked over the network.

Am I affected by CVE-2026-93981?

Check whether you run Hono or hono (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-93981: Hono JSX cross-site scripting in unescaped string rendering

Q: Is there a fix for CVE-2026-93981?

Yes. hono (npm): upgrade to 4.13.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-93981 attacked?

It is attacked over the network.

Q: Am I affected by CVE-2026-93981?

Check whether you run Hono or hono (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-93981 · Severity: medium · CVSS 4.7 · Published 2026-09-19

Hono is a web framework that includes a JSX rendering engine for server-side HTML generation. Versions before 4.13.7 fail to properly escape plain strings in certain contexts (Suspense boundaries, error handlers, and context providers), allowing attackers who control input strings to inject malicious HTML and JavaScript that executes in users' browsers. This can lead to session hijacking, credential theft, or malware distribution.

Technologies: Hono, hono (npm). Vendors: Hono, npm.

Quick answers

Is CVE-2026-93981 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-93981 being exploited in the wild.
How severe is CVE-2026-93981?: Medium severity, with a CVSS score of 4.7, published 19 September 2026.
Which products and versions are affected?: Hono before 4.13.7; hono (npm) < 4.13.7, SEMVER:introduced=0,fixed=4.13.7.
Is there a fix for CVE-2026-93981?: Yes. hono (npm): upgrade to 4.13.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-93981 attacked?: It is attacked over the network.
Am I affected by CVE-2026-93981?: Check whether you run Hono or hono (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

hono (npm): upgrade to 4.13.7 or later
```
npm install hono@4.13.7
```

Technical details

The vulnerability is a cross-site scripting (CWE-79) flaw in hono/jsx's server-side rendering where certain code paths treat string input as pre-escaped HTML markup without performing HTML entity encoding. Affected paths include Suspense fallbacks, ErrorBoundary children with async siblings, single Context.Provider children, and root values passed to renderToString() or renderToReadableStream() in hono/jsx/dom/server. An attacker who controls a string rendered in these positions during server-side rendering can execute arbitrary script under the application origin; client-side rendering and strings wrapped in elements are not affected.

Affected products

Hono Hono before 4.13.7

Identifiers

CVE-2026-93981
GHSA-hxh3-vqpv-xpqv

Timeline

2026-09-04: disclosed
2026-09-04: patched: Version 4.13.7 released

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.