Vulnerability-Lookup

UBUNTU-CVE-2026-33320 (CVE-2026-33320)

Vulnerability from osv_ubuntu – Published: 2026-03-24 01:17 – Updated: 2026-10-17 09:40 – Source website

Details

Dasel is a command-line tool and library for querying, modifying, and transforming data structures. Starting in version 3.0.0 and prior to version 3.3.1, Dasel's YAML reader allows an attacker who can supply YAML for processing to trigger extreme CPU and memory consumption. The issue is in the library's own UnmarshalYAML implementation, which manually resolves alias nodes by recursively following yaml.Node.Alias pointers without any expansion budget, bypassing go-yaml v4's built-in alias expansion limit. Version 3.3.2 contains a patch for the issue.

Severity

6.2 (Medium)


                    
                      CVSS:3.1/AV:L/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-2026-33320	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-33320	REPORT
	https://github.com/TomWright/dasel/security/advis…	REPORT
	https://github.com/TomWright/dasel/pull/531	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dasel",
            "binary_version": "2.6.0-1ubuntu0.3+esm2"
          },
          {
            "binary_name": "golang-github-tomwright-dasel-dev",
            "binary_version": "2.6.0-1ubuntu0.3+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "dasel",
        "purl": "pkg:deb/ubuntu/dasel@2.6.0-1ubuntu0.3+esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.0-1",
        "2.6.0-1build1",
        "2.6.0-1ubuntu0.1",
        "2.6.0-1ubuntu0.2",
        "2.6.0-1ubuntu0.2+esm1",
        "2.6.0-1ubuntu0.3",
        "2.6.0-1ubuntu0.3+esm1",
        "2.6.0-1ubuntu0.3+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dasel",
            "binary_version": "2.8.1-1"
          },
          {
            "binary_name": "golang-github-tomwright-dasel-dev",
            "binary_version": "2.8.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "dasel",
        "purl": "pkg:deb/ubuntu/dasel@2.8.1-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.8.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dasel",
            "binary_version": "3.11.2-2"
          },
          {
            "binary_name": "golang-github-tomwright-dasel-dev",
            "binary_version": "3.11.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "dasel",
        "purl": "pkg:deb/ubuntu/dasel@3.11.2-2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.8.1-1build1",
        "3.11.0-1",
        "3.11.2-1",
        "3.11.2-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dasel",
            "binary_version": "2.8.1-1build1"
          },
          {
            "binary_name": "golang-github-tomwright-dasel-dev",
            "binary_version": "2.8.1-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "dasel",
        "purl": "pkg:deb/ubuntu/dasel@2.8.1-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.8.1-1",
        "2.8.1-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "Dasel is a command-line tool and library for querying, modifying, and transforming data structures. Starting in version 3.0.0 and prior to version 3.3.1, Dasel\u0027s YAML reader allows an attacker who can supply YAML for processing to trigger extreme CPU and memory consumption. The issue is in the library\u0027s own `UnmarshalYAML` implementation, which manually resolves alias nodes by recursively following `yaml.Node.Alias` pointers without any expansion budget, bypassing go-yaml v4\u0027s built-in alias expansion limit. Version 3.3.2 contains a patch for the issue.",
  "id": "UBUNTU-CVE-2026-33320",
  "modified": "2026-10-17T09:40:50Z",
  "published": "2026-03-24T01:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33320"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33320"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TomWright/dasel/security/advisories/GHSA-4fcp-jxh7-23x8"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TomWright/dasel/pull/531"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-33320"
  ]
}

CVE-2026-33320 (GCVE-0-2026-33320)

Vulnerability from cvelistv5 – Published: 2026-03-24 00:06 – Updated: 2026-03-26 12:24

Title

Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service

Summary

Dasel is a command-line tool and library for querying, modifying, and transforming data structures. Starting in version 3.0.0 and prior to version 3.3.1, Dasel's YAML reader allows an attacker who can supply YAML for processing to trigger extreme CPU and memory consumption. The issue is in the library's own `UnmarshalYAML` implementation, which manually resolves alias nodes by recursively following `yaml.Node.Alias` pointers without any expansion budget, bypassing go-yaml v4's built-in alias expansion limit. Version 3.3.2 contains a patch for the issue.

Severity

6.2 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-26 12:24 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7886 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/TomWright/dasel/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
TomWright	dasel	Affected: >= 3.0.0, < 3.3.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33320",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-26T12:24:19.541190Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-26T12:24:32.421Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dasel",
          "vendor": "TomWright",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.3.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-24T00:06:22.351Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/TomWright/dasel/security/advisories/GHSA-4fcp-jxh7-23x8",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/TomWright/dasel/security/advisories/GHSA-4fcp-jxh7-23x8"
        }
      ],
      "source": {
        "advisory": "GHSA-4fcp-jxh7-23x8",
        "discovery": "UNKNOWN"
      },
      "title": "Dasel has unbounded YAML alias expansion in dasel leads to CPU/memory denial of service"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33320",
    "datePublished": "2026-03-24T00:06:22.351Z",
    "dateReserved": "2026-03-18T21:23:36.677Z",
    "dateUpdated": "2026-03-26T12:24:32.421Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.
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