CVE-2026-39244Public exploitNetwork attack vector

Process crash via unbounded ZIP buffer allocation

Published Jul 10, 2026 · Updated Jul 10, 2026

Denial of service in adm-zip before 0.6.0 allows remote attackers to crash Node.js processes by supplying a crafted ZIP archive. zipEntry.js passes the central directory's untrusted uncompressed-size value to Buffer.alloc without an upper bound or compressed-size check, before CRC validation. Any application that processes an attacker-supplied archive through an affected read, test, or extraction method can exhaust process memory and terminate.

CVSS severity7.5
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in adm-zip before 0.6.0 allows remote attackers to crash Node.js processes by supplying a crafted ZIP archive. zipEntry.js passes the central directory's untrusted uncompressed-size value to Buffer.alloc without an upper bound or compressed-size check, before CRC validation. Any application that processes an attacker-supplied archive through an affected read, test, or extraction method can exhaust process memory and terminate.

The record

CVE
CVE-2026-39244
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, CWE-789, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

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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