undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields
Impact
The setCookie function has two attribute injection paths. validateCookieDomain does not reject semicolons (validateCookiePath already does at 0x3B), so a domain value like example.com; SameSite=None lands verbatim as Domain=example.com; SameSite=None. The unparsed array's loop only checks each entry contains = and does not sanitize values, so an entry like X-Custom=val; HttpOnly lands unchanged, injecting HttpOnly without the caller setting cookie.httpOnly = true.
Applications that pass user-controlled input to these fields, typically multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, Secure or HttpOnly forced or stripped, or the intended SameSite tier overridden.
Patches
Patched in undici v6.28.0, v7.29.0, and v8.9.0.
Workarounds
- Sanitize
domainvalues against the RFC 1034 letter-digit-hyphen set before passing tosetCookie. - Do not pass user-controlled data to the
unparsedfield.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | undici | < 6.28.0, >= 7.0.0, < 7.29.0, >= 8.0.0, < 8.9.0 | 6.28.0, 7.29.0, 8.9.0 |
Referencias
- https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm
- https://nvd.nist.gov/vuln/detail/CVE-2026-16729
- https://github.com/nodejs/undici/commit/10d93fc332f2c8c161982dec3833201de29891b5
- https://github.com/nodejs/undici/commit/3bf91ddb493e853957f3a58e155326a668ab8aef
- https://github.com/nodejs/undici/commit/af7484043ee075a6f216da0ad77e1dac55199235
- https://cna.openjsf.org/security-advisories.html
- https://github.com/nodejs/undici
- https://github.com/nodejs/undici/releases/tag/v6.28.0
- https://github.com/nodejs/undici/releases/tag/v7.29.0
- https://github.com/nodejs/undici/releases/tag/v8.9.0
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N- Debilidad (CWE)
CWE-74- Plataforma
- npm
- Paquete
undici- Publicada
- 03.08.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-v3r7-h72x-cjcm - CC BY 4.0
Historial de vulnerabilidades: undici
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 46
- Primera → última
- 06.2022 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 13
- Media 21
- Baja 12
Divulgaciones por año
- 2022: 5
- 2023: 3
- 2024: 5
- 2025: 2
- 2026: 31
-
undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields esta entrada
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