CVE-2026-6734

EUVD-2026-37760

17.06.2026, 18:18

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	HIGH	LOW	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 27%

Affected Products (NVD)

Vendor	Product	Version
nodejs	undici	7.23.0 ≤ 𝑥 < 7.28.0
nodejs	undici	8.0.0 ≤ 𝑥 < 8.2.0

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
Red Hat	Cryostat 4 on RHEL 9	4.2.0-13 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Enterprise Linux 10	1:24.18.0-1.el10_2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Enterprise Linux 8	8100020260630152626.6d880403 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Enterprise Linux 9	9080020260626074955.rhel9 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782840519 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782839981 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782839193 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782838753 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782841925 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782844225 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782839658 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782838476 ≤ 𝑥 < *	ADP
Red Hat	Cluster Observability Operator 1.5.0	1782839494 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Developer Hub 1.10	1783448184 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Developer Hub 1.9	1784210921 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Hardened Images	26.3.0-1.2.hum1 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Hardened Images	1.96.0-1.hum1 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Hardened Images	24.18.0-0.3.hum1 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Hardened Images	25.9.0-1.1.hum1 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.29	1782498792 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.29	1783007534 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.29	1782989367 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.29	1785245777 ≤ 𝑥 < *	ADP

Debian Releases

Debian Product

Codename

node-undici

bookworm	5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 fixed
bookworm (security)	5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 fixed
forky	8.5.0+dfsg+~cs3.2.0-3 fixed
sid	8.9.0+dfsg+~cs3.2.0-1 fixed
trixie	no-dsa