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CVE-2026-2581— undici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler via Response Buffering leads to DoS

Quick assessment

Affected
undici undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

undici是Node.js开源的一个HTTP/1.1客户端。 undici存在安全漏洞，该漏洞源于重复请求的响应数据可能累积在内存中，可能导致拒绝服务攻击。

CVSS 5.9 · Medium EPSS 0.71% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-2581

Vulnerability Information
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Vulnerability Title
undici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler via Response Buffering leads to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
undici 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
undici是Node.js开源的一个HTTP/1.1客户端。 undici存在安全漏洞，该漏洞源于重复请求的响应数据可能累积在内存中，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
undici undici < 6.24.0; 7.0.0 < 7.24.0 -

II. Public POCs for CVE-2026-2581

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III. Intelligence Information for CVE-2026-2581

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Vendor Advisories for CVE-2026-2581 (1)

Same Patch Batch · undici · 2026-03-12 · 6 CVEs total

CVE-2026-1526 7.5 HIGH undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflat
CVE-2026-1528 7.5 HIGH undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and cras
CVE-2026-2229 7.5 HIGH undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid serv
CVE-2026-1525 6.5 MEDIUM undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Respon
CVE-2026-1527 4.6 MEDIUM undici is vulnerable to CRLF Injection via upgrade option

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-770

V. Comments for CVE-2026-2581

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