CVE-2026-2581Network attack vector

Process termination via deduplicated response buffering

Published Mar 12, 2026 · Updated Mar 12, 2026

Uncontrolled resource consumption in Node.js Undici before 6.24.0 or after 7.0.0 and before 7.24.0 allows remote attackers to crash applications. DeduplicationHandler accumulates large or chunked upstream response bodies in memory for concurrent identical requests instead of streaming chunks to waiting handlers. The issue is reachable only when the deduplication interceptor is enabled against an attacker-controlled or untrusted upstream; memory exhaustion can terminate the hosting Node.js process without affecting data confidentiality or integrity.

CVSS severity5.9
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Node.js Undici before 6.24.0 or after 7.0.0 and before 7.24.0 allows remote attackers to crash applications. DeduplicationHandler accumulates large or chunked upstream response bodies in memory for concurrent identical requests instead of streaming chunks to waiting handlers. The issue is reachable only when the deduplication interceptor is enabled against an attacker-controlled or untrusted upstream; memory exhaustion can terminate the hosting Node.js process without affecting data confidentiality or integrity.

The record

CVE
CVE-2026-2581
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Node.js
Product
Undici
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.24.0; 7.0.0 < 7.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Undiciversion=< 6.24.0; 7.0.0 < 7.24.0

Published CVSS scores

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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