GHSA-69xw-7hcm-h432Published

Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-44455

Published

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.

Source published: 13 May 2026 14:57:05 UTC
Source modified: 14 May 2026 13:46:11 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

euvd · EUVD-2026-30034

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: May 13, 2026, 2:57:05 PM

dateUpdated: May 14, 2026, 1:46:11 PM

Source published: May 13, 2026, 2:57:05 PM (timezone not stated)
Source modified: May 14, 2026, 1:46:11 PM (timezone not stated)
Observed here: 28 Oct 2026 06:07:39 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd · CVE-2026-44455

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-74

Original publisher date fields

published: 2026-05-13T16:16:57.433

lastModified: 2026-10-26T14:10:00.130

1 source CPE criteria · context only

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 13 May 2026 16:16:57 UTC
Source modified: 26 Oct 2026 14:10:00 UTC
Observed here: 27 Oct 2026 11:12:09 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS 3.1 · [email protected] · Primary · 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

osv · GHSA-69xw-7hcm-h432

Published

## Summary Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic `jsx()` or `createElement()` APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. ## Details When rendering JSX elements to HTML strings, attribute values are escaped and attribute names are validated. However, element tag names were previously inserted into the output without validation. If a tag name contains characters such as `<`, `>`, quotes, or whitespace, it may alter the structure of the generated HTML. For example, malformed tag names can: * Break out of the intended element and introduce unintended HTML elements * Inject attributes or event handlers into the rendered output This issue arises when untrusted input (such as query parameters or database content) is used as JSX tag names via `jsx()` or `createElement()` during server-side rendering. ## Impact An attacker who can control tag names used in JSX rendering may inject unintended HTML into the generated output. This may lead to: * Injection of unexpected HTML elements or attributes * Corruption of the HTML structure * Cross-site scripting (XSS) when combined with unsafe usage patterns This issue only affects applications that construct JSX tag names from untrusted input. Applications using static or allowlisted tag names are not affected.

Source published: 6 May 2026 23:49:43 UTC
Source modified: 10 Sep 2026 03:50:45 UTC
Observed here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Publisher rating · MODERATE