Vulnerability-Lookup

UBUNTU-CVE-2026-93318 (CVE-2026-93318)

Vulnerability from osv_ubuntu – Published: 2026-10-05 18:17 – Updated: 2026-10-08 09:52 – Source website

Details

A malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents. If a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build. The issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz.

Severity

7.5 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-93318	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-93318	REPORT
	https://github.com/moby/buildkit/security/advisor…	REPORT

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",
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          }
        ]
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      "package": {
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        "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"
        }
      ],
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        "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"
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          {
            "binary_name": "golang-github-docker-docker-dev",
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          {
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        "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",
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        "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"
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        "purl": "pkg:deb/ubuntu/docker.io@20.10.21-0ubuntu1~20.04.6+esm2?arch=source\u0026distro=esm-apps/focal"
      },
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            }
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        }
      ],
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        "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",
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        "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": {
        "binaries": [
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            "binary_version": "26.1.3-0ubuntu1~20.04.1+esm2"
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      "package": {
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        "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"
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        "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",
        "26.1.3-0ubuntu1~20.04.1+esm2"
      ]
    },
    {
      "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"
            }
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        }
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        "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",
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        "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": {
        "binaries": [
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            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~22.04.2"
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      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "docker.io-app",
        "purl": "pkg:deb/ubuntu/docker.io-app@29.1.3-0ubuntu3~22.04.2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
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        "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",
        "26.1.3-0ubuntu1~22.04.1+esm1",
        "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",
        "29.1.3-0ubuntu3~22.04.2"
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      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.25+dfsg1-2ubuntu1.24.04.1+esm1"
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      "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"
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        "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"
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    {
      "ecosystem_specific": {
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          {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~24.04.2"
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      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "docker.io-app",
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      },
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        {
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            }
          ],
          "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",
        "26.1.3-0ubuntu1~24.04.1+esm1",
        "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",
        "29.1.3-0ubuntu3~24.04.2"
      ]
    },
    {
      "ecosystem_specific": {
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          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "27.5.1+dfsg4-2ubuntu1"
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      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@27.5.1+dfsg4-2ubuntu1?arch=source\u0026distro=resolute"
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        "27.5.1+dfsg4-1ubuntu1",
        "27.5.1+dfsg4-2ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "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",
        "29.1.3-0ubuntu4.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents. If a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build. The issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz.",
  "id": "UBUNTU-CVE-2026-93318",
  "modified": "2026-10-08T09:52:01Z",
  "published": "2026-10-05T18:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-93318"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93318"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/buildkit/security/advisories/GHSA-f2v9-hprr-32q3"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-93318"
  ]
}

CVE-2026-93318 (GCVE-0-2026-93318)

Vulnerability from cvelistv5 – Published: 2026-10-05 17:45 – Updated: 2026-10-05 19:06

Title

Cache poisoning via unvalidated image layer DiffIDs

Summary

Severity

7.5 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-05 19:06 UTC

CWE

CWE-354 - Improper Validation of Integrity Check Value

Assigner

Docker CNA under the mitre root

CNA scorecard B 88/100 over 32 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/moby/buildkit/security/advisor…	vendor-advisory
https://github.com/moby/buildkit/releases/tag/v0.33.1	patch

Impacted products

1 product

Vendor	Product	Version
moby	BuildKit	Affected: 0 , < 0.33.1 (semver)

Credits

Kohei Tokunaga (https://github.com/ktock)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-93318",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-05T19:06:32.028591Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-05T19:06:41.297Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "github.com/moby/buildkit",
          "product": "BuildKit",
          "vendor": "moby",
          "versions": [
            {
              "lessThan": "0.33.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
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      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kohei Tokunaga (https://github.com/ktock)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents.\u003c/p\u003e\u003cp\u003eIf a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build.\u003c/p\u003e\u003cp\u003eThe issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz.\u003c/p\u003e"
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          "value": "A malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents.\n\nIf a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build.\n\nThe issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz."
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      "metrics": [
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            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-354",
              "description": "CWE-354: Improper Validation of Integrity Check Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-05T17:45:39.491Z",
        "orgId": "686469e6-3ff6-451b-ab8b-cf5b9e89401e",
        "shortName": "Docker"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/moby/buildkit/security/advisories/GHSA-f2v9-hprr-32q3"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/moby/buildkit/releases/tag/v0.33.1"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Cache poisoning via unvalidated image layer DiffIDs",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eDo not share BuildKit daemon cache between trusted and untrusted builds. Use isolated BuildKit daemons or ephemeral builders for untrusted image sources, or prune BuildKit cache after processing untrusted images.\u003c/p\u003e\u003cp\u003eDisabling stargz alone is not sufficient because regular snapshotters are also affected.\u003c/p\u003e"
            }
          ],
          "value": "Do not share BuildKit daemon cache between trusted and untrusted builds. Use isolated BuildKit daemons or ephemeral builders for untrusted image sources, or prune BuildKit cache after processing untrusted images.\n\nDisabling stargz alone is not sufficient because regular snapshotters are also affected."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "686469e6-3ff6-451b-ab8b-cf5b9e89401e",
    "assignerShortName": "Docker",
    "cveId": "CVE-2026-93318",
    "datePublished": "2026-10-05T17:45:39.491Z",
    "dateReserved": "2026-09-17T17:17:49.216Z",
    "dateUpdated": "2026-10-05T19:06:41.297Z",
    "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.

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-2026-93318 (CVE-2026-93318)

CVE-2026-93318 (GCVE-0-2026-93318)

Tags

Sightings

Nomenclature

Related by attack behaviour