Hono missing validation of cookie name on write path in setCookie()

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0042, the 36th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 7 Apr 2026, 04:14 UTC Published by the maintainers as a GitHub repository advisory

Sources

• GitHub Advisory Database: GHSA-26pp-8wgv-hjvm
• OSV: GHSA-26pp-8wgv-hjvm
• github.com/honojs/hono/security/advisories/GHSA-26pp-8wgv-hjvm
• nvd.nist.gov/vuln/detail/CVE-2026-56762
• github.com/honojs/hono/commit/a586cd72e3f6122792e631ecf1817e5cabb803ec
• github.com/honojs/hono
• github.com/honojs/hono/releases/tag/v4.12.12
• www.vulncheck.com/advisories/hono-missing-cookie-name-validation-in-setcookie

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.