Vulnerability-Lookup

UBUNTU-CVE-2026-33747 (CVE-2026-33747)

Vulnerability from osv_ubuntu – Published: 2026-04-22 00:00 – Updated: 2026-05-20 15:27 – Source website

Details

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with #syntax or --build-arg BUILDKIT_SYNTAX. Using these options with a well-known frontend image like docker/dockerfile is not affected.

Severity

8.4 (High)


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

9.8 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-33747	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-33747	REPORT
	https://github.com/moby/buildkit/releases/tag/v0.28.1	REPORT
	https://github.com/moby/buildkit/security/advisor…	REPORT
	https://ubuntu.com/security/notices/USN-8230-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@18.09.7-0ubuntu1~16.04.9+esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.2~dfsg1-1ubuntu4",
        "1.10.2-0ubuntu3",
        "1.10.2-0ubuntu4",
        "1.10.3-0ubuntu1",
        "1.10.3-0ubuntu4",
        "1.10.3-0ubuntu5",
        "1.10.3-0ubuntu6",
        "1.11.2-0ubuntu5~16.04",
        "1.12.1-0ubuntu13~16.04.1",
        "1.12.3-0ubuntu4~16.04.2",
        "1.12.6-0ubuntu1~16.04.1",
        "1.13.1-0ubuntu1~16.04.2",
        "17.03.2-0ubuntu2~16.04.1",
        "18.06.1-0ubuntu1~16.04.2",
        "18.06.1-0ubuntu1.2~16.04.1",
        "18.09.2-0ubuntu1~16.04.1",
        "18.09.5-0ubuntu1~16.04.2",
        "18.09.7-0ubuntu1~16.04.1",
        "18.09.7-0ubuntu1~16.04.4",
        "18.09.7-0ubuntu1~16.04.5",
        "18.09.7-0ubuntu1~16.04.6",
        "18.09.7-0ubuntu1~16.04.7",
        "18.09.7-0ubuntu1~16.04.9+esm1",
        "18.09.7-0ubuntu1~16.04.9+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.21-0ubuntu1~18.04.3+esm3?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.1-0ubuntu6",
        "17.03.2-0ubuntu1",
        "17.03.2-0ubuntu3",
        "17.03.2-0ubuntu5",
        "17.12.1-0ubuntu1",
        "18.06.1-0ubuntu1~18.04.1",
        "18.06.1-0ubuntu1.2~18.04.1",
        "18.09.2-0ubuntu1~18.04.1",
        "18.09.5-0ubuntu1~18.04.2",
        "18.09.7-0ubuntu1~18.04.1",
        "18.09.7-0ubuntu1~18.04.3",
        "18.09.7-0ubuntu1~18.04.4",
        "19.03.6-0ubuntu1~18.04.1",
        "19.03.6-0ubuntu1~18.04.2",
        "19.03.6-0ubuntu1~18.04.3",
        "20.10.2-0ubuntu1~18.04.2",
        "20.10.2-0ubuntu1~18.04.3",
        "20.10.7-0ubuntu1~18.04.1",
        "20.10.7-0ubuntu1~18.04.2",
        "20.10.7-0ubuntu5~18.04.2",
        "20.10.7-0ubuntu5~18.04.3",
        "20.10.12-0ubuntu2~18.04.1",
        "20.10.21-0ubuntu1~18.04.2",
        "20.10.21-0ubuntu1~18.04.3",
        "20.10.21-0ubuntu1~18.04.3+esm1",
        "20.10.21-0ubuntu1~18.04.3+esm2",
        "20.10.21-0ubuntu1~18.04.3+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.21-0ubuntu1~20.04.6+esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "19.03.2-0ubuntu1",
        "19.03.6-0ubuntu1",
        "19.03.8-0ubuntu1",
        "19.03.8-0ubuntu1.20.04",
        "19.03.8-0ubuntu1.20.04.1",
        "19.03.8-0ubuntu1.20.04.2",
        "20.10.2-0ubuntu1~20.04.2",
        "20.10.2-0ubuntu1~20.04.3",
        "20.10.7-0ubuntu1~20.04.1",
        "20.10.7-0ubuntu1~20.04.2",
        "20.10.7-0ubuntu5~20.04.1",
        "20.10.7-0ubuntu5~20.04.2",
        "20.10.12-0ubuntu2~20.04.1",
        "20.10.21-0ubuntu1~20.04.1",
        "20.10.21-0ubuntu1~20.04.2",
        "20.10.21-0ubuntu1~20.04.4",
        "20.10.21-0ubuntu1~20.04.5",
        "20.10.21-0ubuntu1~20.04.6",
        "20.10.21-0ubuntu1~20.04.6+esm1",
        "20.10.21-0ubuntu1~20.04.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "26.1.3-0ubuntu1~20.04.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@26.1.3-0ubuntu1~20.04.1+esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.1.3-0ubuntu1~20.04.1+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.25-0ubuntu1~20.04.1",
        "20.10.25-0ubuntu1~20.04.2",
        "24.0.5-0ubuntu1~20.04.1",
        "24.0.7-0ubuntu2~20.04.1",
        "26.1.3-0ubuntu1~20.04.1",
        "26.1.3-0ubuntu1~20.04.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~22.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~22.04.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu3~22.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.25-0ubuntu1~22.04.1",
        "20.10.25-0ubuntu1~22.04.2",
        "24.0.5-0ubuntu1~22.04.1",
        "24.0.7-0ubuntu2~22.04.1",
        "26.1.3-0ubuntu1~22.04.1",
        "27.5.1-0ubuntu3~22.04.1",
        "27.5.1-0ubuntu3~22.04.2",
        "28.2.2-0ubuntu1~22.04.1",
        "29.1.3-0ubuntu3~22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.21-0ubuntu1~22.04.8+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.7-0ubuntu5",
        "20.10.7-0ubuntu7",
        "20.10.12-0ubuntu1",
        "20.10.12-0ubuntu2",
        "20.10.12-0ubuntu3",
        "20.10.12-0ubuntu3+gke1.24.1",
        "20.10.12-0ubuntu4",
        "20.10.21-0ubuntu1~22.04.2",
        "20.10.21-0ubuntu1~22.04.3",
        "20.10.21-0ubuntu1~22.04.5",
        "20.10.21-0ubuntu1~22.04.6",
        "20.10.21-0ubuntu1~22.04.7",
        "20.10.21-0ubuntu1~22.04.7+esm1",
        "20.10.21-0ubuntu1~22.04.7+esm2",
        "20.10.21-0ubuntu1~22.04.8",
        "20.10.21-0ubuntu1~22.04.8+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~24.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu3~24.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "24.0.5-0ubuntu1",
        "24.0.7-0ubuntu1",
        "24.0.7-0ubuntu2",
        "24.0.7-0ubuntu3",
        "24.0.7-0ubuntu4",
        "24.0.7-0ubuntu4.1",
        "26.1.3-0ubuntu1~24.04.1",
        "27.5.1-0ubuntu3~24.04.1",
        "27.5.1-0ubuntu3~24.04.2",
        "28.2.2-0ubuntu1~24.04.1",
        "29.1.3-0ubuntu3~24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.25+dfsg1-2ubuntu1.24.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.25+dfsg1-2ubuntu1.24.04.1+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.24+dfsg1-1ubuntu2",
        "20.10.25+dfsg1-2ubuntu1",
        "20.10.25+dfsg1-2ubuntu1+esm1",
        "20.10.25+dfsg1-2ubuntu1+esm2",
        "20.10.25+dfsg1-2ubuntu1.24.04.1",
        "20.10.25+dfsg1-2ubuntu1.24.04.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "26.1.5+dfsg1-9ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@26.1.5+dfsg1-9ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "26.1.5+dfsg1-9ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~25.10.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "27.5.1-0ubuntu3",
        "27.5.1-0ubuntu4",
        "28.2.2-0ubuntu1",
        "29.1.3-0ubuntu3~25.10.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "27.5.1+dfsg4-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@27.5.1+dfsg4-2ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "26.1.5+dfsg1-9ubuntu1",
        "27.5.1+dfsg4-1ubuntu1",
        "27.5.1+dfsg4-2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu4.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu4.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "28.2.2-0ubuntu1",
        "29.1.2-0ubuntu1",
        "29.1.3-0ubuntu1",
        "29.1.3-0ubuntu2",
        "29.1.3-0ubuntu3",
        "29.1.3-0ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.",
  "id": "UBUNTU-CVE-2026-33747",
  "modified": "2026-05-20T15:27:22Z",
  "published": "2026-04-22T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33747"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33747"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/buildkit/releases/tag/v0.28.1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8230-1"
    }
  ],
  "related": [
    "USN-8230-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-33747"
  ]
}

CVE-2026-33747 (GCVE-0-2026-33747)

Vulnerability from cvelistv5 – Published: 2026-03-27 00:49 – Updated: 2026-03-27 19:59

Title

BuildKit vulnerable to malicious frontend causing file escape outside of storage root

Summary

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.

Severity

8.4 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-27 13:25 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/moby/buildkit/security/advisor…	x_refsource_CONFIRM
https://github.com/moby/buildkit/releases/tag/v0.28.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
moby	buildkit	Affected: < 0.28.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33747",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-27T13:25:53.698360Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-27T19:59:06.907Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "buildkit",
          "vendor": "moby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.28.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-27T00:49:06.165Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/moby/buildkit/security/advisories/GHSA-4c29-8rgm-jvjj"
        },
        {
          "name": "https://github.com/moby/buildkit/releases/tag/v0.28.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/moby/buildkit/releases/tag/v0.28.1"
        }
      ],
      "source": {
        "advisory": "GHSA-4c29-8rgm-jvjj",
        "discovery": "UNKNOWN"
      },
      "title": "BuildKit vulnerable to malicious frontend causing file escape outside of storage root"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33747",
    "datePublished": "2026-03-27T00:49:06.165Z",
    "dateReserved": "2026-03-23T18:30:14.124Z",
    "dateUpdated": "2026-03-27T19:59:06.907Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

USN-8230-1 (UBUNTU-CVE-2026-33747)

Vulnerability from osv_ubuntu – Published: 2026-05-06 03:28 – Updated: 2026-05-20 14:48 – Source website

Summary

docker.io-app vulnerabilities

Details

It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. (CVE-2026-33747)

It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. (CVE-2026-33748)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8230-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-33747	REPORT
	https://ubuntu.com/security/CVE-2026-33748	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33747",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33748",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "26.1.3-0ubuntu1~20.04.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@26.1.3-0ubuntu1~20.04.1+esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.1.3-0ubuntu1~20.04.1+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.25-0ubuntu1~20.04.1",
        "20.10.25-0ubuntu1~20.04.2",
        "24.0.5-0ubuntu1~20.04.1",
        "24.0.7-0ubuntu2~20.04.1",
        "26.1.3-0ubuntu1~20.04.1",
        "26.1.3-0ubuntu1~20.04.1+esm1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33747",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33748",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~22.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~22.04.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu3~22.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.10.25-0ubuntu1~22.04.1",
        "20.10.25-0ubuntu1~22.04.2",
        "24.0.5-0ubuntu1~22.04.1",
        "24.0.7-0ubuntu2~22.04.1",
        "26.1.3-0ubuntu1~22.04.1",
        "27.5.1-0ubuntu3~22.04.1",
        "27.5.1-0ubuntu3~22.04.2",
        "28.2.2-0ubuntu1~22.04.1",
        "29.1.3-0ubuntu3~22.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33747",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33748",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~24.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu3~24.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "24.0.5-0ubuntu1",
        "24.0.7-0ubuntu1",
        "24.0.7-0ubuntu2",
        "24.0.7-0ubuntu3",
        "24.0.7-0ubuntu4",
        "24.0.7-0ubuntu4.1",
        "26.1.3-0ubuntu1~24.04.1",
        "27.5.1-0ubuntu3~24.04.1",
        "27.5.1-0ubuntu3~24.04.2",
        "28.2.2-0ubuntu1~24.04.1",
        "29.1.3-0ubuntu3~24.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33747",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33748",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu4.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu4.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "29.1.3-0ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "28.2.2-0ubuntu1",
        "29.1.2-0ubuntu1",
        "29.1.3-0ubuntu1",
        "29.1.3-0ubuntu2",
        "29.1.3-0ubuntu3",
        "29.1.3-0ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that BuildKit, contained within Docker, incorrectly\nhandled file path validation when processing frontend API messages. An\nattacker could possibly use this issue to write files outside of the\nintended state directory. (CVE-2026-33747)\n\nIt was discovered that BuildKit, contained within Docker, incorrectly\nvalidated the subdir component of Git URL fragments. An attacker could\npossibly use this issue to access files outside of the checked-out\nrepository root. (CVE-2026-33748)",
  "id": "USN-8230-1",
  "modified": "2026-05-20T14:48:19Z",
  "published": "2026-05-06T03:28:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8230-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33747"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33748"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "docker.io-app vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-33747",
    "UBUNTU-CVE-2026-33748"
  ]
}

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.

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.

Action not permitted

UBUNTU-CVE-2026-33747 (CVE-2026-33747)

CVE-2026-33747 (GCVE-0-2026-33747)

USN-8230-1 (UBUNTU-CVE-2026-33747)

Tags

Sightings

Nomenclature

Related by attack behaviour