undicis setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.
Weakness
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Undici | Nodejs | * | 6.28.0 (excluding) |
| Undici | Nodejs | 7.0.0 (including) | 7.29.0 (excluding) |
| Undici | Nodejs | 8.0.0 (including) | 8.9.0 (excluding) |
| Red Hat Hardened Images | RedHat | nodejs26-main-26.5.1-1.5.hum1 | * |
| Red Hat Hardened Images | RedHat | nodejs24-main-24.18.1-0.1.hum1 | * |
Potential Mitigations
Related Attack Patterns
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