CVE-2026-84947Network attack vectorHinoki check available

Response truncation via premature dump completion

Published Sep 4, 2026 · Updated Sep 4, 2026

Improper response handling in Node.js Undici 7.1.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to truncate data. The dump interceptor signals completion at maxSize for a chunked response without Content-Length but neither pauses the parser nor aborts the request. Continued body delivery triggers a second completion assertion and disconnects the connection, while the application observes a successful status with an empty or truncated body.

CVSS severity3.7
Low
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper response handling in Node.js Undici 7.1.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to truncate data. The dump interceptor signals completion at maxSize for a chunked response without Content-Length but neither pauses the parser nor aborts the request. Continued body delivery triggers a second completion assertion and disconnects the connection, while the application observes a successful status with an empty or truncated body.

The record

CVE
CVE-2026-84947
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Node.js
Product
Undici
Classifications
CWE-20, CWE-248, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=7.1.0 <7.29.1
  2. Affected versionversion=8.0.0 <8.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Undiciversion=7.1.0 <7.29.1; version=8.0.0 <8.10.2

Published CVSS scores

3.7OpenJS Foundation CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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-20Improper Input Validation
CWE-248Uncaught Exception
T1565.002Transmitted Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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