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High 7.5Published Jun 17, 2026

CVE-2026-6734undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse

Updated under an hour ago ()

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It affects undici and 14 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-346, CWE-940
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
openjs
NVD analysis
Modified
Record last updated
Sep 10, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
undici undici
undici:undici (from the name)
from 7.23.0 before 7.26.0; 7.26.0 not affected; from 8.0.0 before 8.2.0; 8.2.0 not affected
CNA record
from 4.2.0-13 not affected
CISA ADP
from 1:24.18.0-1.el10_2 not affected
CISA ADP
Red Hat Cluster Observability Operator 1.5.0
redhat:cluster_observability_operator
from 1782840519 not affected
CISA ADP
from 1783448184 not affected
CISA ADP
from 26.3.0-1.2.hum1 not affected
CISA ADP
from 1787801527 not affected
CISA ADP
Red Hat Red Hat Openshift Data Foundation 4.18
redhat:openshift_data_foundation
from 1786705347 not affected
CISA ADP
from 1782498792 not affected
CISA ADP
Red Hat OpenShift Pipelines
redhat:openshift_pipelines
1
CISA ADP
7
CISA ADP
1
CISA ADP
4
CISA ADP
2
CISA ADP
nodejs undici
nodejs:undici
from 7.23.0 before 7.28.0; from 8.0.0 before 8.2.0
NVD

References

  • mitigation, vendor-advisory
  • vendor-advisory

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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