python-dotenv — security advisory

{
  "id": "d4b0bda20de93b283bfc10b91ab453832010e6f6f8b7075dc715ac92aa96e9c5",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-28684",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-28684",
    "summary": "python-dotenv reads key-value pairs from a .env file and can set them as environment variables. Prior to version 1.2.2, `set_key()` and `unset_key()` in python-dotenv follow symbolic links when rewriting `.env` files, allowing a local attacker to overwrite arbitrary files via a crafted symlink when a cross-device rename fallback is triggered. Users should upgrade to v.1.2.2 or, as a workaround, apply the patch manually.",
    "evidence": "osv:DEBIAN-CVE-2026-28684",
    "products": [
      {
        "name": {
          "value": "python-dotenv",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.21.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.2.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.2.1-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-dotenv",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.2.1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.2.1-2",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-dotenv",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.1-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.2.1-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.2.1-2",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-28684",
      "aliases": [
        "DEBIAN-CVE-2026-28684"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-dotenv",
            "purl": "pkg:deb/debian/python-dotenv?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "0.21.0-1",
            "1.0.0-1",
            "1.0.1-1",
            "1.2.1-1",
            "1.2.1-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28684.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-dotenv",
            "purl": "pkg:deb/debian/python-dotenv?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "1.0.1-1",
            "1.2.1-1",
            "1.2.1-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28684.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-dotenv",
            "purl": "pkg:deb/debian/python-dotenv?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.0.1-1",
            "1.2.1-1",
            "1.2.1-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28684.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T09:47:43.401298023Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-28684"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-28684"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-28684",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461357,
  "published_at": "2026-04-20T17:16:33.087+00:00"
}