CVE-2026-14257Public exploitNetwork attack vector

Process crash via unbounded brace expansion length

Published Jul 23, 2026 · Updated Jul 23, 2026

Denial of service in Julian Gruber brace-expansion 5.0.7 and earlier allows attackers to crash a Node.js process via crafted brace groups. The expand() function caps the result count but not total string length, retaining progressively larger results and intermediate arrays until memory is exhausted. Reachability requires an application to pass attacker-influenced input directly to expand() or transitively through minimatch or glob.

CVSS severity7.5
High
EPSS probability0.64%
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 Julian Gruber brace-expansion 5.0.7 and earlier allows attackers to crash a Node.js process via crafted brace groups. The expand() function caps the result count but not total string length, retaining progressively larger results and intermediate arrays until memory is exhausted. Reachability requires an application to pass attacker-influenced input directly to expand() or transitively through minimatch or glob.

The record

CVE
CVE-2026-14257
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
Julian Gruber
Product
brace-expansion
Classifications
CWE-770, CWE-400, CAPEC-469, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 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=0 <=5.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Julian Gruber · brace-expansionversion=0 <=5.0.7

Published CVSS scores

7.5sealCVSS: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-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
CAPEC-469HTTP DoS
T1499.004Application or System Exploitation

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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