{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "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"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: managesieve-login pre-auth excessive memory usage\n     DoS via oversized AUTHENTICATE initial response (ELSCVE-158960)\n     - debian/patches/CVE-2026-27858.patch: verify the AUTHENTICATE initial\n       response size is not too large before allocating in\n       pigeonhole/src/managesieve-login/client-authenticate.c. Backport of\n       upstream pigeonhole commit 54f645225a8a; hunk context is this tree's\n       pre-cc1b8988 (unreformatted) layout.\n     - CVE-2026-27858",
        "title": "Details"
      }
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      "contact_details": "https://tuxcare.com/contact/",
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        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786675596",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1786675596"
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        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/advisories/2026/clsa-2026_1786675596.json"
      }
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      "current_release_date": "2026-08-14T02:47:32Z",
      "generator": {
        "date": "2026-08-14T02:47:32Z",
        "engine": {
          "name": "pyCSAF"
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      },
      "id": "CLSA-2026:1786675596",
      "initial_release_date": "2026-08-14T02:47:32Z",
      "revision_history": [
        {
          "date": "2026-08-14T02:47:32Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-27858"
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        {
          "category": "description",
          "text": "Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.\r\n Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.",
          "title": "Vulnerability description"
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}