{
  "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",
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/vex/2026/cve-2026-53799-els_os-debian11els.json"
      }
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      "current_release_date": "2026-09-18T13:36:40Z",
      "generator": {
        "date": "2026-09-18T13:36:40Z",
        "engine": {
          "name": "pyCSAF"
        }
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      "id": "CVE-2026-53799-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-2026-53799"
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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 symlink race condition vulnerability that allows local attackers to cause rsync to apply arbitrary ACLs or extended attributes to unintended files by substituting a symlink at a predictable destination path between the file write and the subsequent acl_set_file() or lsetxattr() call. Attackers can exploit this timing window to redirect ACL and xattr application through a crafted symlink to files outside the intended destination tree, potentially granting elevated permissions and enabling local privilege escalation.",
          "title": "Vulnerability description"
        }
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-53799"
        },
        {
          "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-phxh-hjqv-39c9",
          "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-phxh-hjqv-39c9"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-acl-xattr-application",
          "url": "https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-acl-xattr-application"
        }
      ],
      "release_date": "2026-08-13T15:19:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-03T15:15:53.282541Z",
          "details": "CVE-2026-53799 is a local-only, high‑complexity TOCTOU race that requires an attacker to already have write access to the rsync destination path and to win a narrow symlink timing window during an active transfer. The vulnerable path is only exercised when ACL or xattr preservation is explicitly enabled (e.g., -A/-X; not part of -a), and any effect outside the destination tree further depends on rsync running with privileges sufficient to modify ACLs/xattrs on those external files—otherwise impact is confined to files the account already controls. With no remote vector and no confidentiality or availability impact, the conditional, timing‑dependent nature of this bug makes it reasonable to deprioritize in typical enterprise VM/server deployments.",
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}