Is CVE-2026-6734 actively exploited?

No active exploitation of CVE-2026-6734 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-6734 be exploited remotely?

Yes. CVE-2026-6734 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-6734?

CVE-2026-6734 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-6734

CWE-346Published: June 17, 2026· Updated: Jun 23, 2026

7.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-6734 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.