Is there a public exploit for CVE-2026-126355?

No public exploit for CVE-2026-126355 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-2026-126355?

CVE-2026-126355 scores CVSS 5.3 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.00176%.

5.3 Medium

Hono: `csrf()` does not check requests sent by hyperlink auditing (`text/ping`)

CVE-2026-126355

Summary csrf() validates a request only when its Content-Type is one of the three types an HTML form can send. Chromium's hyperlink auditing ( ) sends a cross-origin POST with the user's cookies and the content type text/ping, which is not in that list. The middleware does not look at Origin or Sec-Fetch-Site for such a request, so it is passed to the handler. Details The middleware skips the origin check when the content type is not one that a form submission produces. The assumption was that any other content type requires a CORS preflight and therefore cannot be sent cross-origin with credentials. Hyperlink auditing is an exception: Chrome and Edge send the ping as a credentialed POST without a preflight, with a fixed body and Content-Type: text/ping. A page on another origin can therefore trigger a POST to any URL of the application. The csrf() options for origin and secFetchSite do not change the outcome, because neither header is evaluated for the request. The request body is fixed, so only actions whose effect does not depend on the body can be triggered. Firefox does not send pings by default. As with any CSRF, the user's cookie must be sent with the request, which with…

Assessment

CVSS: 5.3 (v3.1)
Severity: Medium
EPSS: 0.00176% 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-352

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

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