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CVE-2026-88038

cookies vulnerable to Set-Cookie attribute injection via unvalidated domain and path options

CVSS 3.1 4.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-88038

Published

cookies is a Node.js library for reading and writing HTTP cookies, used by Koa via ctx.cookies. In versions before 0.9.2 the library validates the cookie name and value against character sets that reject the semicolon separator, but the domain and path options are checked only against a permissive RFC 7230 field-content matcher that allows semicolons, and both are written into the Set-Cookie header unescaped. An application that passes untrusted or request-derived data into the domain or path option can therefore inject additional cookie attributes, overriding SameSite, Secure, HttpOnly, or Domain on the cookies the application issues. This is a Set-Cookie attribute injection issue (CWE-74). The issue is fixed in cookies 0.9.2, which validates domain and path against RFC 6265 character sets. As a workaround, keep domain and path application-set rather than derived from untrusted input.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-88038

Published

cookies

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "cookies",
                    "product": "cookies",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "0.9.2"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "0.9.2"
                        }
                    ],
                    "packageURL": "pkg:npm/cookies"
                }

Original source record · Cite this exact observation · Complete original publisher JSON