Fix CVE(s): CVE-2026-53784, CVE-2026-53802, CVE-2026-53803

{
  "id": "2f51426ba5bdcb237b5240b6c22d6b01e98b6bc7d6fe868e10c25493bbbdbfe4",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1788955971",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fix CVE(s): CVE-2026-53784, CVE-2026-53802, CVE-2026-53803",
    "summary": "* SECURITY UPDATE: daemon module-root chdir escape under `use chroot = no` - debian/patches/CVE-2026-53784.patch: add safe_open_no_attacker_symlinks() to util.c and route change_dir()'s daemon module-root chdir through it, so a planted parent-component symlink no longer moves the daemon's CWD outside the module; a symlink is followed only when owned by uid 0 or our euid - CVE-2026-53784 * SECURITY UPDATE: arbitrary file read via symlinked operator input paths - debian/patches/CVE-2026-53802.patch: open --filter merge files (including per-directory merges and -C .cvsignore), --files-from/--include-from/ --exclude-from (exclude.c) and the --password-file / daemon secrets file (authenticate.c) through the same ownership-checked walk, so a planted symlink cannot feed an arbitrary file to the filter parser or the authentication response - CVE-2026-53802 * SECURITY UPDATE: arbitrary file write via symlinked operator output paths - debian/patches/CVE-2026-53803.patch: open --log-file (log.c), the --write-batch/--read-batch files (batch.c and main.c) and the daemon motd, lock and --config paths (clientserver.c, connection.c, params.c) through the same ownership-checked walk, so a planted symlink cannot redirect a privileged write, and require --read-batch to name a regular file or a FIFO - CVE-2026-53803 * NOTE: the ownership-checked path walk opens each intermediate directory for reading, where plain path resolution needed only search permission, so an operator path under a search-o",
    "evidence": "osv:CLSA-2026-1788955971",
    "products": [
      {
        "name": {
          "value": "rsync",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.1.2-2.1ubuntu1.6+tuxcare.els10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1788955971",
      "aliases": [
        "CLSA-2026-1788955971"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.1.2-2.1ubuntu1.6+tuxcare.els10"
                }
              ]
            }
          ],
          "package": {
            "name": "rsync",
            "purl": "pkg:deb/tuxcare/rsync?distro=ubuntu-18.04",
            "ecosystem": "TuxCare:Ubuntu:18.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1788955971.json"
          }
        }
      ],
      "modified": "2026-10-26T09:32:03.918060455Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-53784",
        "CVE-2026-53802",
        "CVE-2026-53803"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1788955971.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53784",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53802",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53803"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-53784",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-53802",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-53803",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449560,
  "published_at": "2026-09-09T12:13:04+00:00"
}