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CVE-2026-6734

HIGH
7.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-6734
State
PUBLISHED
Assigner
openjs
Reserved
2026-04-20 22:57 UTC
Published
2026-06-17 16:36 UTC
Last updated
2026-06-17 18:26 UTC
Primary CWE
CWE-346
CWE-346: Origin Validation Error
Vendor / Product
undici / undici
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
undici undici — 7.23.0 < 7.26.0, 7.26.0, 8.0.0 < 8.2.0, 8.2.0
Weakness (CWE)
CWESourceDescription
CWE-346 cna CWE-346: Origin Validation Error
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References (2)
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