Container blob cache can accept unverified content

{
  "id": "96edeafaae46ad5a7b39d6d75185370ca03c26b4fe27420fee5fe2f578d40796",
  "url": "https://osv.dev/vulnerability/CVE-2026-93317",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Container blob cache can accept unverified content",
    "summary": "An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.",
    "evidence": "osv:CVE-2026-93317",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-93317",
      "aliases": [
        "CVE-2026-93317",
        "GHSA-p3rc-w3hc-pqvv"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moby/buildkit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5245d869d85d9c98f986b600584c332a3b001986"
                },
                {
                  "fixed": "8c91502cf280bd70a0c50912ce251c46a8881d9f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.28.0"
                      },
                      {
                        "fixed": "0.33.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8c91502cf280bd70a0c50912ce251c46a8881d9f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.33.1"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93317.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.429280490Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93317.json",
        "https://github.com/moby/buildkit/security/advisories/GHSA-p3rc-w3hc-pqvv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93317",
        "https://github.com/moby/buildkit/releases/tag/v0.33.1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-354"
        ],
        "cna_assigner": "Docker",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93317.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93317",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518933,
  "published_at": "2026-10-05T17:43:44.903+00:00"
}