Allocation of Resources Without Limits or Throttling in undici - CVE-2026-2581
Published: April 24, 2026
Vulnerability identifier: #VU127580
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-2581
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Node.js
Affected software:
undici
undici
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in DeduplicationHandler when processing deduplicated requests with large or chunked response bodies from an attacker-controlled or untrusted upstream endpoint. A remote attacker can trigger concurrent identical requests that cause response data to accumulate in memory to cause a denial of service.
Only applications with interceptors.deduplicate() enabled are vulnerable.
How to mitigate CVE-2026-2581
Install security update from vendor's website.