OCI layer symlink escape → arbitrary host write

{
  "id": "f21d3ea477156080b766c47dbbc68c710917b7c41011e92d146516424904e3a8",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2026-0148",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OCI layer symlink escape → arbitrary host write",
    "summary": "Affected versions of `boxlite` extract OCI image layer tarballs without fully containing path resolution to the extraction root. A crafted layer containing a symlink whose target is an absolute on-host path (e.g. `escape -> /tmp`) followed by a file entry that resolves through that symlink (e.g. `escape//pwned.txt`) caused the extractor to write the payload to the host filesystem outside the intended rootfs directory. The fix in v0.9.0 routes every destructive filesystem operation through a `SafeRoot` handle (`openat2(RESOLVE_IN_ROOT)` on Linux, lexical fallback elsewhere) so that no tar entry can resolve outside the extraction root, even with adversarial symlinks placed by earlier entries in the same layer. This is a container-escape during image extraction, exploitable by any user who pulls or loads a malicious OCI image — including via `SimpleBox(rootfs_path=...)` from an untrusted local layout.",
    "evidence": "osv:RUSTSEC-2026-0148",
    "products": [
      {
        "name": {
          "value": "boxlite",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "RUSTSEC-2026-0148",
      "aliases": [
        "CVE-2026-46703",
        "GHSA-f396-4rp4-7v2j",
        "GO-2026-5344",
        "PYSEC-2026-298",
        "RUSTSEC-2026-0148"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.0-0"
                },
                {
                  "fixed": "0.9.0"
                }
              ]
            }
          ],
          "package": {
            "name": "boxlite",
            "purl": "pkg:cargo/boxlite",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0148.json",
            "categories": [
              "privilege-escalation",
              "file-disclosure"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-12T18:00:13.556256982Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/boxlite",
        "https://rustsec.org/advisories/RUSTSEC-2026-0148.html",
        "https://github.com/boxlite-ai/boxlite/pull/429",
        "https://github.com/boxlite-ai/boxlite/pull/446",
        "https://github.com/boxlite-ai/boxlite/pull/461"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46703",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 306446,
  "published_at": "2026-05-16T12:00:00+00:00"
}