Vulnerability-Lookup

CVE-2026-61712 (GCVE-0-2026-61712)

Vulnerability from cvelistv5 – Published: 2026-08-19 20:01 – Updated: 2026-08-21 19:04

Title

BuildKit: Possible runtime DoS via unbounded group parsing

Summary

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, BuildKit read attacker-controlled /etc/passwd and /etc/group files without an upper bound while resolving a username to a user identifier or group identifier in executor/oci/user.go and solver/llbsolver/ops/user_linux.go. A malicious base image or build could provide oversized files that exhausted memory during user resolution and caused out-of-memory termination of the buildkitd process. This issue is fixed in version 0.31.1.

Severity

2.3 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 19:04 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/moby/buildkit/security/advisor…	x_refsource_CONFIRM
https://github.com/moby/buildkit/commit/408266e4b…	x_refsource_MISC
https://github.com/moby/buildkit/commit/69a392464…	x_refsource_MISC
https://github.com/moby/buildkit/releases/tag/v0.31.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
moby	buildkit	Affected: < 0.31.1	guessed

Show details on NVD website

JSON

To clipboard

{
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          {
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              "content": {
                "id": "CVE-2026-61712",
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T19:04:21.592888Z",
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        }
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      "title": "BuildKit: Possible runtime DoS via unbounded group parsing"
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FKIE_CVE-2026-61712

Vulnerability from fkie_nvd - Published: 2026-08-19 20:17 - Updated: 2026-08-21 20:16

Severity

2.3 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/moby/buildkit/commit/408266e4ba254cecabedaacdad6905de4d2a75a1
	security-advisories@github.com	https://github.com/moby/buildkit/commit/69a3924648e485acb3faad3081e03a8554431255
	security-advisories@github.com	https://github.com/moby/buildkit/releases/tag/v0.31.1
	security-advisories@github.com	https://github.com/moby/buildkit/security/advisories/GHSA-72x6-4j93-7w86

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "buildkit",
          "vendor": "moby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.31.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, BuildKit read attacker-controlled /etc/passwd and /etc/group files without an upper bound while resolving a username to a user identifier or group identifier in executor/oci/user.go and solver/llbsolver/ops/user_linux.go. A malicious base image or build could provide oversized files that exhausted memory during user resolution and caused out-of-memory termination of the buildkitd process. This issue is fixed in version 0.31.1."
    }
  ],
  "id": "CVE-2026-61712",
  "lastModified": "2026-08-21T20:16:38.010",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.3,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "type": "Secondary"
      }
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    "ssvcV203": [
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          "options": [
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    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/moby/buildkit/commit/69a3924648e485acb3faad3081e03a8554431255"
    },
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      "url": "https://github.com/moby/buildkit/releases/tag/v0.31.1"
    },
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      "url": "https://github.com/moby/buildkit/security/advisories/GHSA-72x6-4j93-7w86"
    }
  ],
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  "vulnStatus": "Received",
  "weaknesses": [
    {
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          "lang": "en",
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      "type": "Secondary"
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}

GHSA-72X6-4J93-7W86

Vulnerability from github – Published: 2026-08-19 20:24 – Updated: 2026-08-19 20:24

Summary

BuildKit has a possible runtime DoS via unbounded group parsing

Details

Impact

Maliciously crafted base image or build can cause a Denial of Service (DoS) condition. When creating a container from this image, memory exhaustion occurs, leading to an Out Of Memory (OOM) kill of the buildkitd process.

Patches

Issue is fixed in BuildKit v0.31.1+

Workarounds

Use trusted build sources.

References

This is BuildKit variant of containerd advisory https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq

Severity

2.3 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.31.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/moby/buildkit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.31.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-61712"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-19T20:24:01Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Impact\nMaliciously crafted base image or build can cause a Denial of Service (DoS) condition. When creating a container from this image, memory exhaustion occurs, leading to an Out Of Memory (OOM) kill of the buildkitd process.\n\n### Patches\nIssue is fixed in BuildKit v0.31.1+\n\n### Workarounds\nUse trusted build sources.\n\n### References\nThis is BuildKit variant of containerd advisory https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq",
  "id": "GHSA-72x6-4j93-7w86",
  "modified": "2026-08-19T20:24:01Z",
  "published": "2026-08-19T20:24:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/security/advisories/GHSA-72x6-4j93-7w86"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/commit/408266e4ba254cecabedaacdad6905de4d2a75a1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/commit/69a3924648e485acb3faad3081e03a8554431255"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/moby/buildkit"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/releases/tag/v0.31.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "BuildKit has a possible runtime DoS via unbounded group parsing"
}

MSRC_CVE-2026-61712

Vulnerability from csaf_microsoft - Published: 2026-08-23 01:04 - Updated: 2026-08-24 14:44

Summary

BuildKit: Possible runtime DoS via unbounded group parsing

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-61712

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-61712 BuildKit: Possible runtime DoS via unbounded group parsing - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-61712.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "BuildKit: Possible runtime DoS via unbounded group parsing",
    "tracking": {
      "current_release_date": "2026-08-24T14:44:41.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.275Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-61712",
      "initial_release_date": "2026-08-23T01:04:17.000Z",
      "revision_history": [
        {
          "date": "2026-08-23T01:04:17.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:44:41.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 moby-engine 0:25.0.3-19.azl3",
                "product": {
                  "name": "azl3 moby-engine 0:25.0.3-19.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "moby-engine"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 moby-engine 0:25.0.3-19.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-61712",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "notes": [
        {
          "category": "general",
          "text": "GitHub_M",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-61712 BuildKit: Possible runtime DoS via unbounded group parsing - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-61712.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-23T01:04:17.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "BuildKit: Possible runtime DoS via unbounded group parsing"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-61712 (GCVE-0-2026-61712)

FKIE_CVE-2026-61712

GHSA-72X6-4J93-7W86

Impact

Patches

Workarounds

References

MSRC_CVE-2026-61712

Tags

Sightings

Nomenclature