Summaryinfo

A vulnerability categorized as problematic has been discovered in undici. The impacted element is the function when interceptors.deduplicate. Executing a manipulation can lead to allocation of resources. The identification of this vulnerability is CVE-2026-2581. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in undici. It has been declared as problematic. This vulnerability affects the function when interceptors.deduplicate. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service (DoS). In vulnerable Undici versions, when interceptors.deduplicate() is enabled, response data for deduplicated requests could be accumulated in memory for downstream handlers. An attacker-controlled or untrusted upstream endpoint can exploit this with large/chunked responses and concurrent identical requests, causing high memory usage and potential OOM process termination. Impacted users are applications that use Undici’s deduplication interceptor against endpoints that may produce large or long-lived response bodies. PatchesThe issue has been patched by changing deduplication behavior to stream response chunks to downstream handlers as they arrive (instead of full-body accumulation), and by preventing late deduplication when body streaming has already started. Users should upgrade to the first official Undici (and Node.js, where applicable) releases that include this patch.

The weakness was shared by Adnan Jakati. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-2581 since 02/16/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 302065 (Linux Distros Unpatched Vulnerability : CVE-2026-2581), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.24.0 or 7.24.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (302065) and CERT Bund (WID-SEC-2026-0933). Once again VulDB remains the best source for vulnerability data.

Affected

• IBM App Connect Enterprise

Productinfo

Name

• undici

Version

• 5.7.1
• 5.8.0
• 5.8.1
• 5.8.2
• 5.19.1
• 5.26.2
• 5.28.4
• 5.28.5
• 5.29.0
• 6.0.0
• 6.6.1
• 6.11.0
• 6.11.1
• 6.19.2
• 6.21.0
• 6.21.1
• 6.21.2
• 6.23.0

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CPE 2.2info

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