Is there a public exploit for CVE-2026-126359?

No public exploit for CVE-2026-126359 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126359?

CVE-2026-126359 scores CVSS 3.4 (v3.1), rated low. EPSS puts the chance of exploitation in the next 30 days at 0.00262%.

3.4 Low

Hono: `css` helper does not escape a closing tag split between the template and an interpolated value, allowing HTML injection

CVE-2026-126359

Summary The css helper in hono/css escapes a / that follows . During server-side rendering the element is closed early and the rest of the value is interpreted as HTML. This issue arises only when < is the last character before an interpolation in a css template, either written in the template or supplied by a preceding value, and the interpolated value is controlled by a client. Impact A client that controls such a value can inject HTML, including script, into the page rendered on the server. This may lead to: Execution of attacker-controlled script in the browser of a user who views the page Exposure of information available to that page This issue affects applications that interpolate untrusted strings into a css template immediately after a <, including two adjacent interpolations such as ${prefix}${name} where both are untrusted. Other uses of the css helper are not affected. Workarounds Do not interpolate untrusted values into css templates, or make sure the text before an interpolated value does not end with <.

Assessment

CVSS: 3.4 (v3.1)
Severity: Low
EPSS: 0.00262% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 12 November 2026
Affected: hono
Weakness: CWE-79

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

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