Vulnerability-Lookup

UBUNTU-CVE-2026-52727 (CVE-2026-52727)

Vulnerability from osv_ubuntu – Published: 2026-09-17 19:16 – Updated: 2026-09-30 21:25 – Source website

Details

lxc-ci contains continuous integration and image-build scripts for LXC. Prior to the 2026-05-28 Arch Linux image publication, images built from images/archlinux.yaml retain the same pacman local-signing private key in /etc/pacman.d/gnupg and redistribute it to every container or virtual machine created from that image. An attacker who controls an HTTP package mirror or can intercept mirror traffic can use the shared pacman signing private key to sign modified packages that affected clients accept as trusted. Installing those packages permits arbitrary code execution as root on the client system. This issue is fixed in Arch Linux images published on or after 2026-05-28.

Severity

7.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-52727	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-52727	REPORT
	https://github.com/lxc/lxc-ci/security/advisories…	REPORT
	https://github.com/lxc/lxc-ci/commit/082cb34ea197…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "distrobuilder-images",
            "binary_version": "0.0~git20240215.ded590d-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "lxc-ci",
        "purl": "pkg:deb/ubuntu/lxc-ci@0.0~git20240215.ded590d-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20240210.e5f93e4-1",
        "0.0~git20240215.ded590d-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "distrobuilder-images",
            "binary_version": "0.0~git20251222.5d84b29-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "lxc-ci",
        "purl": "pkg:deb/ubuntu/lxc-ci@0.0~git20251222.5d84b29-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20250414.b414478-1",
        "0.0~git20250929.bcfa5c7-1",
        "0.0~git20251222.5d84b29-1"
      ]
    }
  ],
  "aliases": [],
  "details": "lxc-ci contains continuous integration and image-build scripts for LXC. Prior to the 2026-05-28 Arch Linux image publication, images built from images/archlinux.yaml retain the same pacman local-signing private key in /etc/pacman.d/gnupg and redistribute it to every container or virtual machine created from that image. An attacker who controls an HTTP package mirror or can intercept mirror traffic can use the shared pacman signing private key to sign modified packages that affected clients accept as trusted. Installing those packages permits arbitrary code execution as root on the client system. This issue is fixed in Arch Linux images published on or after 2026-05-28.",
  "id": "UBUNTU-CVE-2026-52727",
  "modified": "2026-09-30T21:25:14Z",
  "published": "2026-09-17T19:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-52727"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52727"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-52727"
  ]
}

CVE-2026-52727 (GCVE-0-2026-52727)

Vulnerability from cvelistv5 – Published: 2026-09-17 18:21 – Updated: 2026-09-17 19:09

Title

lxc-ci: Pacman keyring stored in archlinux image with a private key

Summary

Severity

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/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 2026-09-17 19:09 UTC

CWE

CWE-321 - Use of Hard-coded Cryptographic Key

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/lxc/lxc-ci/security/advisories…	x_refsource_CONFIRM
https://github.com/lxc/lxc-ci/commit/082cb34ea197…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
lxc	lxc-ci	Affected: < 2026-05-28

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-52727",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-17T19:09:36.526095Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-17T19:09:46.925Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "lxc-ci",
          "vendor": "lxc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026-05-28"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "lxc-ci contains continuous integration and image-build scripts for LXC. Prior to the 2026-05-28 Arch Linux image publication, images built from images/archlinux.yaml retain the same pacman local-signing private key in /etc/pacman.d/gnupg and redistribute it to every container or virtual machine created from that image. An attacker who controls an HTTP package mirror or can intercept mirror traffic can use the shared pacman signing private key to sign modified packages that affected clients accept as trusted. Installing those packages permits arbitrary code execution as root on the client system. This issue is fixed in Arch Linux images published on or after 2026-05-28."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-321",
              "description": "CWE-321: Use of Hard-coded Cryptographic Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T18:21:21.718Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp"
        },
        {
          "name": "https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a"
        }
      ],
      "source": {
        "advisory": "GHSA-4h59-f67g-5qxp",
        "discovery": "UNKNOWN"
      },
      "title": "lxc-ci: Pacman keyring stored in archlinux image with a private key"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52727",
    "datePublished": "2026-09-17T18:21:21.718Z",
    "dateReserved": "2026-06-08T14:00:43.571Z",
    "dateUpdated": "2026-09-17T19:09:46.925Z",
    "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.

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UBUNTU-CVE-2026-52727 (CVE-2026-52727)

CVE-2026-52727 (GCVE-0-2026-52727)

Tags

Sightings

Nomenclature

Related by attack behaviour