{
  "fix": "ALAS2023-2026-2157",
  "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2157",
  "summary": "ALAS2023-2026-2157, released September 14, 2026, fixes 11 CVEs across 5 products. None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "Security update for 5 packages",
  "released": "2026-09-14T09:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2026-66046, high severity",
  "supported": true,
  "cveCount": 11,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00742,
  "maxCvss": 7.8,
  "vendorAdvisory": "https://alas.aws.amazon.com/AL2023/ALAS-2026-2157.html",
  "appliesTo": [
    {
      "product": "expat",
      "productUrl": "https://patchblox.com/security/product/linux/expat",
      "release": "amzn 2023",
      "fixedVersion": "2.8.3-1.amzn2023.0.1",
      "supported": true
    },
    {
      "product": "expat-debuginfo",
      "productUrl": "https://patchblox.com/security/product/linux/expat-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.8.3-1.amzn2023.0.1",
      "supported": true
    },
    {
      "product": "expat-debugsource",
      "productUrl": "https://patchblox.com/security/product/linux/expat-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "2.8.3-1.amzn2023.0.1",
      "supported": true
    },
    {
      "product": "expat-devel",
      "productUrl": "https://patchblox.com/security/product/linux/expat-devel",
      "release": "amzn 2023",
      "fixedVersion": "2.8.3-1.amzn2023.0.1",
      "supported": true
    },
    {
      "product": "expat-static",
      "productUrl": "https://patchblox.com/security/product/linux/expat-static",
      "release": "amzn 2023",
      "fixedVersion": "2.8.3-1.amzn2023.0.1",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-66046",
      "url": "https://patchblox.com/security/cve/CVE-2026-66046",
      "title": "Expat Denial of Service via storeAtts() Quadratic Complexity",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00742,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-76957",
      "url": "https://patchblox.com/security/cve/CVE-2026-76957",
      "title": "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.",
      "priority": "High",
      "severity": "Moderate",
      "cvss": 7.8,
      "epss": 0.00107,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-50219",
      "url": "https://patchblox.com/security/cve/CVE-2026-50219",
      "title": "libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,",
      "priority": "Routine",
      "severity": "Low",
      "cvss": 6.9,
      "epss": 0.00181,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56412",
      "url": "https://patchblox.com/security/cve/CVE-2026-56412",
      "title": "libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 5.9,
      "epss": 0.00179,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56131",
      "url": "https://patchblox.com/security/cve/CVE-2026-56131",
      "title": "libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 4.9,
      "epss": 0.00175,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56404",
      "url": "https://patchblox.com/security/cve/CVE-2026-56404",
      "title": "libexpat before 2.8.2 has an integer overflow in addBinding.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.9,
      "epss": 0.0013,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56410",
      "url": "https://patchblox.com/security/cve/CVE-2026-56410",
      "title": "xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.9,
      "epss": 0.00129,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56411",
      "url": "https://patchblox.com/security/cve/CVE-2026-56411",
      "title": "xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.9,
      "epss": 0.00129,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56405",
      "url": "https://patchblox.com/security/cve/CVE-2026-56405",
      "title": "libexpat before 2.8.2 has an integer overflow in getAttributeId.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.9,
      "epss": 0.00125,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56408",
      "url": "https://patchblox.com/security/cve/CVE-2026-56408",
      "title": "expat: libexpat before 2.8.2 has an integer overflow in copyString.",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.9,
      "epss": 0.00125,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-56409",
      "url": "https://patchblox.com/security/cve/CVE-2026-56409",
      "title": "xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.",
      "priority": "Routine",
      "severity": "Moderate",
      "cvss": 6.5,
      "epss": 0.00119,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}