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    "aggregate_severity": {
      "text": "Critical"
    },
    "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: Out-of-bounds read and resultant infinite loop\n     because low surrogates were treated the same as high surrogates in\n     the *_toUtf16 functions (libexpat before 2.8.3)\n     - debian/patches/CVE-2026-72522.patch: mask the high byte of the\n       trailing code unit with 0xFC instead of 0xF8 in the\n       DEFINE_UTF16_TO_UTF16(E) macro in expat/lib/xmltok.c, so the guard\n       that avoids splitting a surrogate pair across two conversion calls\n       matches only genuine high surrogates (0xD800-0xDBFF) and no longer\n       accepts low surrogates (0xDC00-0xDFFF).  On a buffer ending in a\n       lone low surrogate the old test reported\n       XML_CONVERT_INPUT_INCOMPLETE without consuming any input, so the\n       caller retried while reading two bytes past the intended limit.\n       One edit covers both little2_toUtf16 and big2_toUtf16.  Reachable\n       in the libexpatw (-DXML_UNICODE) build, which is where xmlparse.c\n       maps XmlConvert to XmlUtf16Convert.\n     - CVE-2026-72522\n   * SECURITY UPDATE: Use-after-free because handler call depth tracking\n     was missing for custom encoding callbacks (libexpat before 2.8.4)\n     - debian/patches/CVE-2026-76957.patch: route the application's\n       unknown-encoding convert and release callbacks through the new\n       callUnknownEncodingConvert() and callUnknownEncodingRelease()\n       wrappers in expat/lib/xmlparse.c, storing the application callback\n       in the new m_unknownEncodingConvert member and passing the parser\n       itself as the encoding's user data.  handleUnknownEncoding\n       previously handed both callbacks out unwrapped, so\n       m_handlerCallDepth stayed at zero while they ran and the\n       reentrancy guard that rejects XML_ParserFree, XML_GetBuffer and\n       XML_ResumeParser from inside a handler did not fire for them.\n     - CVE-2026-76957",
        "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-2026:1789394882",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789394882"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1789394882.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-14T14:09:04Z",
      "generator": {
        "date": "2026-09-14T14:09:04Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1789394882",
      "initial_release_date": "2026-09-14T14:09:04Z",
      "revision_history": [
        {
          "date": "2026-09-14T14:09:04Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-72522, CVE-2026-76957"
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        "category": "default_component_of",
        "full_product_name": {
          "name": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel as a component of Debian 11",
          "product_id": "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel"
        },
        "product_reference": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64 as a component of Debian 11",
          "product_id": "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64"
        },
        "product_reference": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64 as a component of Debian 11",
          "product_id": "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64"
        },
        "product_reference": "libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
        "relates_to_product_reference": "Debian-11"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-76957",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "description",
          "text": "libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.",
          "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": {
        "fixed": [
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          "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
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          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.armel"
        ],
        "known_affected": [
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          "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
          "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-76957"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1322",
          "url": "https://github.com/libexpat/libexpat/pull/1322"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1329",
          "url": "https://github.com/libexpat/libexpat/pull/1329"
        }
      ],
      "release_date": "2026-08-20T05:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-14T14:08:05.184186Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1789394882",
          "product_ids": [
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.armel"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789394882"
        },
        {
          "category": "none_available",
          "date": "2026-08-20T05:16:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.armel"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els1.armel",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.armel"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-72522",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "description",
          "text": "libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
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          "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
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          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
          "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.armel"
        ],
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-72522"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.mozilla.org/show_bug.cgi?id=2053153",
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2053153"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1296",
          "url": "https://github.com/libexpat/libexpat/pull/1296"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/11/5",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/11/5"
        }
      ],
      "release_date": "2026-08-10T04:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-14T14:08:05.184186Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1789394882",
          "product_ids": [
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:libexpat1-0:2.2.10-2+deb11u7+tuxcare.els2.armel",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.amd64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.arm64",
            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els2.armel"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789394882"
        },
        {
          "category": "none_available",
          "date": "2026-08-10T04:16:00Z",
          "details": "Affected",
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            "Debian-11:expat-0:2.2.10-2+deb11u7+tuxcare.els1.arm64",
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            "Debian-11:libexpat1-dev-0:2.2.10-2+deb11u7+tuxcare.els1.amd64",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ]
    }
  ]
}