{
  "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": "CVE-2026-93990: reject a UTF-16 high surrogate that is not followed by a low\n  surrogate, by adding LITTLE2_/BIG2_IS_INVALID_CHAR and the matching\n  little2_/big2_isInvalid4 vtable entries to the UTF-16 tokenizers in\n  lib/xmltok.c, so a lone high surrogate can no longer consume the following\n  code unit as a fake low surrogate and hide markup from the parser",
        "title": "Details"
      }
    ],
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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
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    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790252195",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790252195"
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        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/centos-stream8els/advisories/2026/clsa-2026_1790252195.json"
      }
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      "current_release_date": "2026-09-24T12:17:16Z",
      "generator": {
        "date": "2026-09-24T12:17:16Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1790252195",
      "initial_release_date": "2026-09-24T12:17:16Z",
      "revision_history": [
        {
          "date": "2026-09-24T12:17:16Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "expat: Fix of 2 CVEs"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-66046"
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        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1321",
          "url": "https://github.com/libexpat/libexpat/pull/1321"
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          "url": "https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity"
        }
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      "release_date": "2026-08-18T15:16:00Z",
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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 through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks.",
          "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"
        }
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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"
        }
      ]
    }
  ]
}