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CVE-2026-6734

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

Published: Jun 17, 2026Updated: Jun 17, 2026 Sources: CVE List NVDCWE-346
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.1%
Top 95.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-346

Affected Products

undiciundici
On-prem
OSS Libraries / npm
undicioss-projectOSS Librariesaka undici

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/nodejs/undici/security/advisories/GHSA-hm92-r4w5-c3mj
github.com
https://cna.openjsf.org/security-advisories.html
cna.openjsf.org

Timeline

Published
Jun 17, 2026
Last Updated
Jun 17, 2026

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