Vulnerability-Lookup

UBUNTU-CVE-2026-14257 (CVE-2026-14257)

Vulnerability from osv_ubuntu – Published: 2026-07-23 14:17 – Updated: 2026-10-17 09:38 – Source website

Details

brace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion. The expand() function limits the number of results with a max option (default 100,000) but does not bound the length of each result string. By chaining multiple brace groups, an attacker keeps the result count under the limit while making each result progressively longer, so total memory scales with both count and string length until the process hits a fatal, uncatchable out-of-memory error. About 7.5 KB of input ('{a,b}'.repeat(1500)) crashes a default Node.js process. Any application that passes attacker-influenced strings to brace-expansion.expand() - directly or transitively via minimatch / glob brace patterns - can be crashed by a small request. Fixed in 5.0.8 by adding a maxLength option (default 4,000,000) that bounds accumulated output and intermediate arrays.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-14257	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-14257	REPORT
	https://github.com/juliangruber/brace-expansion/c…	REPORT
	https://github.com/juliangruber/brace-expansion	REPORT
	https://github.com/juliangruber/brace-expansion/c…	REPORT
	https://www.npmjs.com/package/brace-expansion	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "1.1.8-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@1.1.8-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.8-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "1.1.11-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@1.1.11-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.8-1",
        "1.1.11-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "2.0.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@2.0.1-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0-1",
        "2.0.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "2.0.1+~1.1.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@2.0.1+~1.1.0-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1-2",
        "2.0.1+~1.1.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "2.1.4+~1.1.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@2.1.4+~1.1.2-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1+~1.1.0-2",
        "2.0.3+~1.1.2-2",
        "2.0.3+~1.1.2-3",
        "2.1.4+~1.1.2-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-brace-expansion",
            "binary_version": "2.0.1+~1.1.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-brace-expansion",
        "purl": "pkg:deb/ubuntu/node-brace-expansion@2.0.1+~1.1.0-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1+~1.1.0-2"
      ]
    }
  ],
  "aliases": [],
  "details": "brace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion. The expand() function limits the number of results with a max option (default 100,000) but does not bound the length of each result string. By chaining multiple brace groups, an attacker keeps the result count under the limit while making each result progressively longer, so total memory scales with both count and string length until the process hits a fatal, uncatchable out-of-memory error. About 7.5 KB of input (\u0027{a,b}\u0027.repeat(1500)) crashes a default Node.js process. Any application that passes attacker-influenced strings to brace-expansion.expand() - directly or transitively via minimatch / glob brace patterns - can be crashed by a small request. Fixed in 5.0.8 by adding a maxLength option (default 4,000,000) that bounds accumulated output and intermediate arrays.",
  "id": "UBUNTU-CVE-2026-14257",
  "modified": "2026-10-17T09:38:01Z",
  "published": "2026-07-23T14:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-14257"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-14257"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/juliangruber/brace-expansion/commit/a1bd33999ea75262c4749fff3bbb0d1372bd07b5"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/juliangruber/brace-expansion"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/juliangruber/brace-expansion/commit/a1bd33999ea75262c4749fff3bbb0d1372bd07b5"
    },
    {
      "type": "REPORT",
      "url": "https://www.npmjs.com/package/brace-expansion"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-14257"
  ]
}

CVE-2026-14257 (GCVE-0-2026-14257)

Vulnerability from cvelistv5 – Published: 2026-07-23 12:54 – Updated: 2026-07-23 14:44

Title

brace-expansion DoS via unbounded expansion length causing an out-of-memory process crash

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-23 14:44 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

seal CNA under the mitre root

CNA scorecard – unranked: 7 records in the last 180 days, 10 needed details

References

3 references

URL	Tags
https://www.npmjs.com/package/brace-expansion
https://github.com/juliangruber/brace-expansion
https://github.com/juliangruber/brace-expansion/c…

Impacted products

1 product

Vendor	Product	Version
juliangruber	brace-expansion	Affected: 0 , ≤ 5.0.7 (semver)

Credits

bnbdr

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-14257",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-23T14:44:31.208878Z",
                "version": "2.0.3"
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              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-23T14:44:41.856Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://www.npmjs.com/package/brace-expansion",
          "defaultStatus": "unaffected",
          "packageName": "brace-expansion",
          "platforms": [
            "Linux",
            "macOS",
            "Windows"
          ],
          "product": "brace-expansion",
          "vendor": "juliangruber",
          "versions": [
            {
              "lessThanOrEqual": "5.0.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "bnbdr"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
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              "type": "text/html",
              "value": "\u003cp\u003ebrace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion. The \u003ccode\u003eexpand()\u003c/code\u003e function limits the number of results with a \u003ccode\u003emax\u003c/code\u003e option (default 100,000) but does not bound the length of each result string. By chaining multiple brace groups, an attacker keeps the result count under the limit while making each result progressively longer, so total memory scales with both count and string length until the process hits a fatal, uncatchable out-of-memory error. About 7.5 KB of input (\u003ccode\u003e\u0027{a,b}\u0027.repeat(1500)\u003c/code\u003e) crashes a default Node.js process. Any application that passes attacker-influenced strings to \u003ccode\u003ebrace-expansion.expand()\u003c/code\u003e - directly or transitively via \u003ccode\u003eminimatch\u003c/code\u003e / \u003ccode\u003eglob\u003c/code\u003e brace patterns - can be crashed by a small request. Fixed in 5.0.8 by adding a \u003ccode\u003emaxLength\u003c/code\u003e option (default 4,000,000) that bounds accumulated output and intermediate arrays.\u003c/p\u003e"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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