CVE-2026-6734 (GCVE-0-2026-6734)

Vulnerability from cvelistv5 – Published: 2026-06-17 16:36 – Updated: 2026-06-17 18:26
VLAI
Title
undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version
undici undici Affected: 7.23.0 , < 7.26.0 (semver)
Unaffected: 7.26.0 (semver)
Affected: 8.0.0 , < 8.2.0 (semver)
Unaffected: 8.2.0 (semver)
Create a notification for this product.
Credits
ChALkeR mcollina UlisesGascon deepview-autofix
Show details on NVD website
To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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