GHSA-4VRQ-3VRQ-G6GG

Vulnerability from github – Published: 2026-03-26 18:27 – Updated: 2026-04-24 20:58
VLAI
Summary
BuildKit Git URL subdir component can cause access to restricted files
Details

Impact

Insufficient validation of Git URL fragment subdir components (<url>#<ref>:<subdir>, docs) may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem.

Patches

The issue has been fixed in version v0.28.1

Workarounds

The issue affects only builds that use Git URLs with a subpath component. Avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2 (High)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/moby/buildkit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33748"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:27:49Z",
    "nvd_published_at": "2026-03-27T15:16:57Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nInsufficient validation of Git URL fragment subdir components (`\u003curl\u003e#\u003cref\u003e:\u003csubdir\u003e`, [docs](https://docs.docker.com/build/concepts/context/#url-fragments)) may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem.\n\n### Patches\nThe issue has been fixed in version v0.28.1\n\n### Workarounds\nThe issue affects only builds that use Git URLs with a subpath component. Avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.",
  "id": "GHSA-4vrq-3vrq-g6gg",
  "modified": "2026-04-24T20:58:22Z",
  "published": "2026-03-26T18:27:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/security/advisories/GHSA-4vrq-3vrq-g6gg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33748"
    },
    {
      "type": "WEB",
      "url": "https://docs.docker.com/build/concepts/context/#url-fragments"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/moby/buildkit"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/buildkit/releases/tag/v0.28.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "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"
    }
  ],
  "summary": "BuildKit Git URL subdir component can cause access to restricted files"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.