Vulnerability-Lookup

UBUNTU-CVE-2026-52791 (CVE-2026-52791)

Vulnerability from osv_ubuntu – Published: 2026-07-29 17:16 – Updated: 2026-10-17 09:44 – Source website

Details

fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.

Severity

2.0 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-52791	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-52791	REPORT
	https://github.com/containers/fuse-overlayfs/secu…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fuse-overlayfs",
            "binary_version": "0.7.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "fuse-overlayfs",
        "purl": "pkg:deb/ubuntu/fuse-overlayfs@0.7.6-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.3-1",
        "0.7-1",
        "0.7.2-1",
        "0.7.3-1",
        "0.7.4-1",
        "0.7.5-1",
        "0.7.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fuse-overlayfs",
            "binary_version": "1.7.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "fuse-overlayfs",
        "purl": "pkg:deb/ubuntu/fuse-overlayfs@1.7.1-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0-1",
        "1.7.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fuse-overlayfs",
            "binary_version": "1.13-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "fuse-overlayfs",
        "purl": "pkg:deb/ubuntu/fuse-overlayfs@1.13-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10-1",
        "1.13-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fuse-overlayfs",
            "binary_version": "1.14-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "fuse-overlayfs",
        "purl": "pkg:deb/ubuntu/fuse-overlayfs@1.14-1build2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fuse-overlayfs",
            "binary_version": "1.14-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "fuse-overlayfs",
        "purl": "pkg:deb/ubuntu/fuse-overlayfs@1.14-1build2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14-1build1",
        "1.14-1build2"
      ]
    }
  ],
  "aliases": [],
  "details": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.",
  "id": "UBUNTU-CVE-2026-52791",
  "modified": "2026-10-17T09:44:22Z",
  "published": "2026-07-29T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-52791"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52791"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-52791"
  ]
}

CVE-2026-52791 (GCVE-0-2026-52791)

Vulnerability from cvelistv5 – Published: 2026-07-29 16:14 – Updated: 2026-07-29 17:56

Title

fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)

Summary

Severity

2 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 17:56 UTC

CWE

CWE-266 - Incorrect Privilege Assignment

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/containers/fuse-overlayfs/secu…	x_refsource_CONFIRM
https://github.com/containers/fuse-overlayfs/comm…	x_refsource_MISC
https://github.com/containers/fuse-overlayfs/rele…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
containers	fuse-overlayfs	Affected: < 1.17

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-52791",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T17:56:35.819478Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-29T17:56:43.388Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "fuse-overlayfs",
          "vendor": "containers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 2,
            "baseSeverity": "LOW",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-266",
              "description": "CWE-266: Incorrect Privilege Assignment",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T16:14:46.724Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
        },
        {
          "name": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f"
        },
        {
          "name": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17"
        }
      ],
      "source": {
        "advisory": "GHSA-2cc4-p72c-v85h",
        "discovery": "UNKNOWN"
      },
      "title": "fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52791",
    "datePublished": "2026-07-29T16:14:46.724Z",
    "dateReserved": "2026-06-08T18:02:19.731Z",
    "dateUpdated": "2026-07-29T17:56:43.388Z",
    "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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