undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse

CAO 8.8CVE-2026-6734 · GHSA-hm92-r4w5-c3mj · Công bố 17/06/2026 · cập nhật 10/09/2026

Tóm tắt nhanh

CVE-2026-6734 là lỗ hổng mức CAO (CVSS 8.8) ảnh hưởng undici (nodejs), undici.
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.34%, cao hơn 28.1% các lỗ hổng khác.
Cách xử lý: cập nhật lên 7.28.0, 8.2.0 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
undici nodejs	`≥ 7.23.0, < 7.28.0≥ 8.0.0, < 8.2.0`	`7.28.08.2.0`
undici npm	`≥ 7.23.0, < 7.28.0≥ 8.0.0, < 8.2.0`	`7.28.08.2.0`

Mô tả

Impact

When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying that the pool's origin matches the requested origin. All requests are dispatched through the pool connected to the first origin, regardless of the intended destination.

This causes cross-origin request routing: credentials and request data intended for origin B are sent to origin A, responses from the wrong origin are trusted, and HTTPS requests may be silently downgraded to HTTP.

Impacted users are applications that use Socks5ProxyAgent (directly or via setGlobalDispatcher) and make requests to more than one origin.

This was introduced in undici 7.23.0 via #4385 and affects all versions through 8.1.0.

Patches

Upgrade to undici v7.28.0 or v8.2.0

Workarounds

Use a separate Socks5ProxyAgent instance per origin, or avoid using Socks5ProxyAgent with multiple origins.

Mô tả của NVD

Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying that the pool's origin matches the requested origin. All requests are dispatched through the pool connected to the first origin, regardless of the intended destination. This causes cross-origin request routing: credentials and request data intended for origin B are sent to origin A, responses from the wrong origin are trusted, and HTTPS requests may be silently downgraded to HTTP. Impacted users are applications that use Socks5ProxyAgent (directly or via setGlobalDispatcher) and make requests to more than one origin. This was introduced in undici 7.23.0 via PR #4385 and affects all versions through 8.1.0. Patches: Upgrade to undici v7.26.0 or v8.2.0. Workarounds: Use a separate Socks5ProxyAgent instance per origin, or avoid using Socks5ProxyAgent with multiple origins.