Cross-origin request misrouting via proxy pool reuse
Published Jun 17, 2026 · Updated Jun 17, 2026
Origin validation failure in Node.js Undici 7.23.0 before 7.28.0 and 8.0.0 before 8.2.0 allows remote attackers to misroute HTTP requests. Socks5ProxyAgent reuses the connection pool created for the first origin without checking that the pool origin matches each later request. Exploitation requires one agent instance to contact multiple origins, letting an attacker-controlled first origin receive later credentials and request data and supply responses trusted for another destination.
Summary
What happened
Origin validation failure in Node.js Undici 7.23.0 before 7.28.0 and 8.0.0 before 8.2.0 allows remote attackers to misroute HTTP requests. Socks5ProxyAgent reuses the connection pool created for the first origin without checking that the pool origin matches each later request. Exploitation requires one agent instance to contact multiple origins, letting an attacker-controlled first origin receive later credentials and request data and supply responses trusted for another destination.
The record
- CVE
- CVE-2026-6734
- Published
- Jun 17, 2026
- Updated
- Jun 17, 2026
- Vendor
- Node.js
- Product
- Undici
- Classifications
- CWE-940, CWE-346, T1557
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 17, 2026CVE publishedPublication date reported by the CVE source.
- Jun 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.23.0 <7.26.0
- Affected versionversion=8.0.0 <8.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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