{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.18.0-rc1"
              },
              {
                "fixed": "1.17.0"
              },
              {
                "introduced": "v0.18.0-rc1-elixir"
              },
              {
                "fixed": "v1.17.0-elixir"
              },
              {
                "introduced": "v0.18.0-rc1-erlang"
              },
              {
                "fixed": "v1.17.0-erlang"
              },
              {
                "introduced": "v0.18.0-rc1-node"
              },
              {
                "fixed": "v1.17.0-node"
              },
              {
                "introduced": "v0.18.0-rc1-node-slim"
              },
              {
                "fixed": "v1.17.0-node-slim"
              },
              {
                "introduced": "v0.18.0-rc1-elixir-slim"
              },
              {
                "fixed": "v1.17.0-elixir-slim"
              },
              {
                "introduced": "v0.18.0-rc1-erlang-slim"
              },
              {
                "fixed": "v1.17.0-erlang-slim"
              },
              {
                "introduced": "v0.18.0-rc1-erlang-alpine"
              },
              {
                "fixed": "v1.17.0-erlang-alpine"
              },
              {
                "introduced": "v0.18.0-rc1-elixir-alpine"
              },
              {
                "fixed": "v1.17.0-elixir-alpine"
              },
              {
                "introduced": "v0.18.0-rc1-node-alpine"
              },
              {
                "fixed": "v1.17.0-node-alpine"
              },
              {
                "introduced": "v0.18.0-rc1-scratch"
              },
              {
                "fixed": "v1.17.0-scratch"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "6b77fbe92b38b7d0a31fd824caaf66d0e1708be5"
            },
            {
              "fixed": "afc1b7d956b433e638d52dbd06470f53a0b26f6a"
            }
          ],
          "repo": "https://github.com/gleam-lang/gleam",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jqvf-f6p2-wrv3"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43965.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "ed7aec0484f10d60978b63788c8a6497590855ab"
          },
          {
            "fixed": "690ca069817bee5f77a28fc3e360627c1da19291"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Path traversal vulnerability in Gleam's dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content.\n\nPackage keys read from build/packages/packages.toml by LocalPackages::read_from_disc are passed without validation to paths.build_packages_package(), which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to fs::delete_directory (which calls remove_dir_all). No check is performed to ensure the path remains within the intended build/packages/ directory. Both absolute paths and relative traversal sequences (e.g. ../) are accepted as package keys, allowing deletion of arbitrary directories.\n\nAn attacker who can cause a victim to run gleam deps download on a project containing a malicious build/packages/packages.toml (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim's system to be recursively deleted.\n\nThis issue affects Gleam from 0.18.0-rc1 until 1.17.0.",
  "id": "CVE-2026-43965",
  "modified": "2026-08-04T11:31:07.768389681Z",
  "published": "2026-06-02T13:41:37.421Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-43965.html"
    },
    {
      "type": "WEB",
      "url": "https://ghcr.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43965"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43965.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43965"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gleam-lang/gleam"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion"
}