CRLF Injection Affecting hono package, versions >=0.2.1 <4.12.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-HONO-15418360
- published5 Mar 2026
- disclosed5 Mar 2026
- creditSaad FELLAHI
Introduced: 5 Mar 2026
NewCVE-2026-29086 (opens in a new tab)How to fix?
Upgrade hono to version 4.12.4 or higher.
Overview
hono is an Ultrafast web framework for the Edges
Affected versions of this package are vulnerable to CRLF Injection via the setCookie() utility. An attacker can inject unauthorized cookie attributes by supplying specially crafted input containing semicolons, carriage returns, or newline characters in the domain or path fields.
Notes:
- Successful exploitation requires the application to pass user-controlled input directly into the
domainorpathoptions ofsetCookie() - This issue is limited to attribute-level manipulation within a single Set-Cookie header.