rust-gix-fs — security advisory

{
  "id": "0cbc8de0099e4fedd2b3562e485788d90e3b76e2abf343b6ed1a68d01c42f8f4",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-44471",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-44471",
    "summary": "gitoxide is an implementation of git written in Rust. Prior to 0.21.1, a malicious tree can be constructed that will, when checked out with gitoxide, permit writing an attacker-controlled symlink into any existing directory the user has write access to. During checkout, all symlink index entries are deferred and created after regular files using a single shared gix_worktree::Stack. Internally, this uses a gix_fs::Stack. gix_fs::Stack::make_relative_path_current() caches validated path prefixes: when the previously-processed leaf component exactly matches the leading component(s) of the next path, the leaf-to-directory transition at gix-fs/src/stack.rs invokes only delegate.push_directory(), never delegate.push(). In gix_worktree::stack::delegate::StackDelegate, when the state member is State::CreateDirectoryAndAttributesStack, Attributes::push_directory() only loads attributes (from the ODB, in the clone case), and does not perform any other checks. The on-disk symlink_metadata() check and unlink-on-collision live in StackDelegate::push()'s invocation of create_leading_directory(), which is therefore bypassed for the cached prefix. The final symlink is created with plain std::os::unix::fs::symlink, which follows symlinks in parent directories. Therefore, it's possible to provide a tree with duplicate symlink and directory entries that exploits this. This vulnerability is fixed in 0.21.1.",
    "evidence": "osv:UBUNTU-CVE-2026-44471",
    "products": [
      {
        "name": {
          "value": "rust-gix-fs",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.8.0-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-gix-fs",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.12.1-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-gix-fs",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.16.1-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "0.21.1-1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-gix-fs",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.12.1-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "0.16.1-1",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-44471",
      "aliases": [
        "UBUNTU-CVE-2026-44471"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-gix-fs",
            "purl": "pkg:deb/ubuntu/rust-gix-fs?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "0.8.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44471.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-gix-fs-dev",
                "binary_version": "0.8.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-gix-fs",
            "purl": "pkg:deb/ubuntu/rust-gix-fs?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "0.12.1-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44471.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-gix-fs-dev",
                "binary_version": "0.12.1-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-gix-fs",
            "purl": "pkg:deb/ubuntu/rust-gix-fs?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "0.16.1-1",
            "0.21.1-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44471.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-gix-fs-dev",
                "binary_version": "0.21.1-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-gix-fs",
            "purl": "pkg:deb/ubuntu/rust-gix-fs?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "0.12.1-1",
            "0.16.1-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44471.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-gix-fs-dev",
                "binary_version": "0.16.1-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:00:08.339320077Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-44471"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-44471",
        "https://www.cve.org/CVERecord?id=CVE-2026-44471",
        "https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-f89h-2fjh-2r9q"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-44471",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 360344,
  "published_at": "2026-05-13T22:16:00+00:00"
}