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  "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/"
      }
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    "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: Denial of service via quadratic complexity in\n     storeAtts(), which scanned elementType->defaultAtts linearly to\n     determine the CDATA status of every non-normalized attribute\n     (libexpat through 2.8.3)\n     - debian/patches/CVE-2026-66046.patch: store the index of the first\n       default attribute declaration in the per-element defaultAttsNames\n       hash table and use a hash lookup instead of the linear scan in\n       expat/lib/xmlparse.c; includes upstream's follow-up for dtdCopy()\n       so that external entity parsers do not read past the hash table\n       entries, and carries upstream's regression test into\n       expat/tests/runtests.c\n     - CVE-2026-66046\n   * SECURITY UPDATE: XML injection via malformed UTF-16 input: a high\n     surrogate not followed by a low surrogate is accepted and consumes\n     the following code unit, hiding markup characters from the parser\n     (libexpat through 2.8.4)\n     - debian/patches/CVE-2026-93990.patch: reject a UTF-16 high\n       surrogate whose second code unit is not a low surrogate by\n       defining IS_INVALID_CHAR (and isInvalid4 for XML_MIN_SIZE) for the\n       little2_/big2_ encodings in expat/lib/xmltok.c and dropping the\n       permissive fallback from expat/lib/xmltok_impl.c; also carries\n       upstream's regression test into expat/tests/runtests.c\n     - CVE-2026-93990",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709150",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790709150"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1790709150.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-29T19:13:26Z",
      "generator": {
        "date": "2026-09-29T19:13:26Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1790709150",
      "initial_release_date": "2026-09-29T19:13:26Z",
      "revision_history": [
        {
          "date": "2026-09-29T19:13:26Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-66046, CVE-2026-93990"
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-66046"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1321",
          "url": "https://github.com/libexpat/libexpat/pull/1321"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity",
          "url": "https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity"
        }
      ],
      "release_date": "2026-08-18T15:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-29T19:12:32.723516Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790709150",
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        },
        {
          "category": "none_available",
          "date": "2026-08-18T15:16:00Z",
          "details": "Affected",
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          "category": "impact",
          "details": "Important"
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      ]
    },
    {
      "cve": "CVE-2026-93990",
      "cwe": {
        "id": "CWE-176",
        "name": "Improper Handling of Unicode Encoding"
      },
      "notes": [
        {
          "category": "description",
          "text": "Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "category": "external",
          "summary": "https://blog.hartwork.org/posts/expat-2-8-5-released/",
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          "url": "https://github.com/libexpat/libexpat"
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          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/releases/tag/R_2_8_5",
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          "category": "external",
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          "url": "https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate"
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      "release_date": "2026-09-19T23:17:00Z",
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          "date": "2026-09-29T19:12:32.723516Z",
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          "category": "none_available",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
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        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}