GHSA-5pq2-9x2x-5p6w

Suggest an improvement
Source
https://github.com/advisories/GHSA-5pq2-9x2x-5p6w
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5pq2-9x2x-5p6w/GHSA-5pq2-9x2x-5p6w.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-5pq2-9x2x-5p6w
Aliases
  • CVE-2026-29086
Downstream
Related
Published
2026-03-04T19:49:14Z
Modified
2026-03-18T23:14:01.277623Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Hono Vulnerable to Cookie Attribute Injection via Unsanitized domain and path in setCookie()
Details

Summary

The setCookie() utility did not validate semicolons (;), carriage returns (\r), or newline characters (\n) in the domain and path options when constructing the Set-Cookie header.

Because cookie attributes are delimited by semicolons, this could allow injection of additional cookie attributes if untrusted input was passed into these fields.

Details

setCookie() builds the Set-Cookie header by concatenating option values. While the cookie value itself is URL-encoded, the domain and path options were previously interpolated without rejecting unsafe characters.

Including ;, \r, or \n in these fields could result in unintended additional attributes (such as SameSite, Secure, Domain, or Path) being appended to the cookie header.

Modern runtimes prevent full header injection via CRLF, so this issue is limited to attribute-level manipulation within a single Set-Cookie header.

The issue has been fixed by rejecting these characters in the domain and path options.

Impact

An attacker may be able to manipulate cookie attributes if an application passes user-controlled input directly into the domain or path options of setCookie().

This could affect cookie scoping or security attributes depending on browser behavior. Exploitation requires application-level misuse of cookie options.

Database specific 
{
    "github_reviewed_at": "2026-03-04T19:49:14Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-1113",
        "CWE-113"
    ],
    "nvd_published_at": "2026-03-04T23:16:10Z",
    "severity": "MODERATE"
}
References

Affected packages

npm / hono

Package

Name
hono
View open source insights on deps.dev
Purl
pkg:npm/hono

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.12.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5pq2-9x2x-5p6w/GHSA-5pq2-9x2x-5p6w.json"