BuildKit proxy CA cleanup can be disrupted by build steps

{
  "id": "fe44c40afc5f72908b5dc58ee55dbbc8dd78fba6c0ae9bc6f1bda0c9f6ad04b9",
  "url": "https://osv.dev/vulnerability/CVE-2026-93315",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "BuildKit proxy CA cleanup can be disrupted by build steps",
    "summary": "When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.",
    "evidence": "osv:CVE-2026-93315",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-93315",
      "aliases": [
        "CVE-2026-93315",
        "GHSA-2f5p-x9ph-g97x"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moby/buildkit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c411f0ac55a2c56d3d68b7d92d257538d5d6f464"
                },
                {
                  "fixed": "8c91502cf280bd70a0c50912ce251c46a8881d9f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.31.0"
                      },
                      {
                        "fixed": "0.33.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8c91502cf280bd70a0c50912ce251c46a8881d9f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.33.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.33.0-rc2",
            "v0.33.0",
            "dockerfile/1.27.0-labs",
            "dockerfile/1.27.0",
            "dockerfile/1.27.0-rc1-labs",
            "dockerfile/1.27.0-rc1",
            "v0.33.0-rc1",
            "v0.32.0",
            "dockerfile/1.26.0-labs",
            "dockerfile/1.26.0",
            "v0.32.0-rc2",
            "dockerfile/1.26.0-rc2-labs",
            "dockerfile/1.26.0-rc2",
            "v0.32.0-rc1",
            "v0.31.0",
            "dockerfile/1.25.0-labs",
            "dockerfile/1.25.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93315.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.101960227Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93315.json",
        "https://github.com/moby/buildkit/security/advisories/GHSA-2f5p-x9ph-g97x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93315",
        "https://github.com/moby/buildkit/releases/tag/v0.33.1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-367"
        ],
        "cna_assigner": "Docker",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93315.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93315",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504310,
  "published_at": "2026-10-05T21:57:08.053+00:00"
}