{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/vex/2026/cve-2026-53796-els_os-debian11els.json"
      }
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    "tracking": {
      "current_release_date": "2026-09-18T13:36:40Z",
      "generator": {
        "date": "2026-09-18T13:36:40Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-53796-ELS_OS-DEBIAN11ELS",
      "initial_release_date": "2026-08-13T15:19:00Z",
      "revision_history": [
        {
          "date": "2026-08-13T15:19:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-17T12:45:34Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-09-18T13:36:40Z",
          "number": "3",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "3"
    },
    "title": "Security update on CVE-2026-53796"
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      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access ('Link Following')"
      },
      "notes": [
        {
          "category": "description",
          "text": "rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the non-daemon receiver's destination directory handling that allows an attacker who can manipulate destination path parent components to redirect file writes to unintended locations. Attackers can substitute a symlink for a component of the destination path between the path resolution and chdir() call, causing the receiver's working directory to be established outside the intended destination tree so that subsequent relative-path file writes land in unintended filesystem locations.",
          "title": "Vulnerability description"
        }
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-53796"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0",
          "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-w75h-ccff-w53m",
          "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-w75h-ccff-w53m"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/rsync-toctou-race-condition-via-destination-directory-handling",
          "url": "https://www.vulncheck.com/advisories/rsync-toctou-race-condition-via-destination-directory-handling"
        }
      ],
      "release_date": "2026-08-13T15:19:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-09T12:17:01.358893Z",
          "details": "This issue only affects the non-daemon receiver and requires a precise TOCTOU race in which an attacker can modify a parent component of the destination path at the exact moment an operator runs rsync, swapping it for a symlink to redirect subsequent relative-path writes—i.e., high complexity with required user interaction. When the destination tree’s parent directories are not writable by untrusted users (the default on Linux) and are not placed under world‑writable locations, the necessary preconditions are absent, so practical exploitability is low in managed server/VM contexts. The impact is integrity-only (misdirected writes) with no confidentiality or availability effect and no privilege escalation, supporting deprioritization.",
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