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        "text": "An update for libxml2 is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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        "text": "The libxml2 library is a development toolbox providing the implementation of various XML standards.\n\nSecurity Fix(es):\n\n* libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)\n\n* libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)\n\n* libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)\n\n* libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode (CVE-2021-3537)\n\n* libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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        {
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          "text": "1954232"
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is out of support scope for Red Hat Enterprise Linux 6 and 7. To learn more about Red Hat Enterprise Linux support life cycles, please see https://access.redhat.com/support/policy/updates/errata .",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "details": "Moderate"
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      "title": "libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c"
    },
    {
      "acknowledgments": [
        {
          "names": [
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          "organization": "SQLab NCTU Taiwan"
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      "cve": "CVE-2021-3518",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2021-04-21T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1954242"
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      "notes": [
        {
          "category": "description",
          "text": "There\u0027s a flaw in libxml2. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is out of support scope for Red Hat Enterprise Linux 6 and 7. To learn more about Red Hat Enterprise Linux support life cycles, please see https://access.redhat.com/support/policy/updates/errata .",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "ids": [
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          "text": "1956522"
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      "notes": [
        {
          "category": "description",
          "text": "A NULL pointer dereference flaw was found in libxml2, where it did not propagate errors while parsing XML mixed content. This flaw causes the application to crash if an untrusted XML document is parsed in recovery mode and post validated. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "For the flaw to be exploitable, the document must be parsed in recovery mode and post validated (e.g.: when used in the `xmlling` tool, both `-recover` and `-postvalid` options must be used for the flaw to be exploitable)",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "title": "Vulnerability description"
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        {
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          "text": "libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-3541"
        },
        {
          "category": "external",
          "summary": "RHBZ#1950515",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1950515"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-3541",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-3541"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3541",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3541"
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      "release_date": "2021-05-13T00:00:00+00:00",
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            "BaseOS-8.4.0.Z.MAIN.EUS:python3-libxml2-debuginfo-0:2.9.7-9.el8_4.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms"
    }
  ]
}