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CVE-2026-6733

undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

Published: Jun 17, 2026Updated: Jun 27, 2026 Sources: CVE List NVDCWE-367
3.7LOW
NVD MITRE
EPSS Score
0.2%
Top 87.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests. This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-367

Affected Products

undici
oss-project
undiciOn-prem
OSS Libraries / npm
nodejs
oss-project·USaka node.js, node
undici
OSS Libraries

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52
github.com
https://hackerone.com/reports/3582376
hackerone.com
https://cna.openjsf.org/security-advisories.html
cna.openjsf.org

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