Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-6733

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
17/06/2026
Last modified:
27/06/2026

Description

Impact:<br /> Undici&amp;#39;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.<br /> <br /> This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse.<br /> <br /> Patches:<br /> Upgrade to undici v6.26.0, v7.28.0 or v8.5.0.<br /> <br /> Workarounds:<br /> Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 3.70 LOW
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x
3.70
Severity 3.x
LOW

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* 6.27.0 (excluding)
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* 7.0.0 (including) 7.28.0 (excluding)
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* 8.0.0 (including) 8.5.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools