CVE-2026-87029Network attack vectorHinoki check available

Client crash via uncaught decompression callback exceptions

Published Oct 15, 2026 · Updated Oct 15, 2026

Uncaught exceptions in Undici 7.15.0 through 7.30.0 and 8.0.0 through 8.12.1 allow remote attackers to crash Node.js clients. The decompress interceptor invokes downstream handlers from asynchronous zlib callbacks without catching their exceptions. Exploitation requires a malicious HTTP response and composition with a throwing handler such as dump; exceeding its decompressed-size limit terminates the process, or hangs the request until its body timeout when a global uncaught-exception handler keeps the process alive.

CVSS severity5.9
Medium
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncaught exceptions in Undici 7.15.0 through 7.30.0 and 8.0.0 through 8.12.1 allow remote attackers to crash Node.js clients. The decompress interceptor invokes downstream handlers from asynchronous zlib callbacks without catching their exceptions. Exploitation requires a malicious HTTP response and composition with a throwing handler such as dump; exceeding its decompressed-size limit terminates the process, or hangs the request until its body timeout when a global uncaught-exception handler keeps the process alive.

The record

CVE
CVE-2026-87029
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
The Node.js Project
Product
Undici
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=7.15.0 <7.30.1
  2. Affected versionversion=8.0.0 <8.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Node.js Project · Undiciversion=7.15.0 <7.30.1; version=8.0.0 <8.12.2

Published CVSS scores

5.9The Node.js ProjectCVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
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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