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      "text": "Moderate"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for python-jinja2 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.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "The python-jinja2 package contains Jinja2, a template engine written in pure Python. Jinja2 provides a Django inspired non-XML syntax but supports inline expressions and an optional sandboxed environment. \n\nSecurity Fix(es):\n\n* python-jinja2: ReDoS vulnerability due to the sub-pattern (CVE-2020-28493)\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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.",
        "title": "Details"
      },
      {
        "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 Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
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      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat offerings.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2021:4161",
        "url": "https://access.redhat.com/errata/RHSA-2021:4161"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/#moderate",
        "url": "https://access.redhat.com/security/updates/classification/#moderate"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/",
        "url": "https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/"
      },
      {
        "category": "external",
        "summary": "1928707",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1928707"
      },
      {
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        "summary": "Canonical URL",
        "url": "https://access.redhat.com/security/data/csaf/v2/advisories/2021/rhsa-2021_4161.json"
      }
    ],
    "title": "Red Hat Security Advisory: python-jinja2 security update",
    "tracking": {
      "current_release_date": "2024-09-13T15:44:54+00:00",
      "generator": {
        "date": "2024-09-13T15:44:54+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "3.33.3"
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      },
      "id": "RHSA-2021:4161",
      "initial_release_date": "2021-11-09T18:22:34+00:00",
      "revision_history": [
        {
          "date": "2021-11-09T18:22:34+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2021-11-09T18:22:34+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2024-09-13T15:44:54+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
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                "name": "Red Hat Enterprise Linux AppStream (v. 8)",
                "product": {
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                  "product_id": "AppStream-8.5.0.GA",
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            "name": "src"
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          "product_id": "AppStream-8.5.0.GA:python-jinja2-0:2.10.1-3.el8.src"
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  "vulnerabilities": [
    {
      "cve": "CVE-2020-28493",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2021-02-15T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1928707"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in python-jinja2. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-jinja2: ReDoS vulnerability in the urlize filter",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is out of support scope for the following products:\n\n* Red Hat Enterprise Linux 6\n* Red Hat Enterprise Linux 7\n* Red Hat Ceph Storage 2\n\nTo learn more about Red Hat Enterprise Linux support scopes, please see https://access.redhat.com/support/policy/updates/errata/\n\nIn Red Hat OpenStack Platform, because python-jinja2 is not directly customer exposed, the Impact has been moved to Low and no updated will be provided at this time for the RHOSP python-jinja2 package.\n\nRed Hat Quay does not make use of the vulnerable function, so the impact is Low.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-8.5.0.GA:python-jinja2-0:2.10.1-3.el8.src",
          "AppStream-8.5.0.GA:python3-jinja2-0:2.10.1-3.el8.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-28493"
        },
        {
          "category": "external",
          "summary": "RHBZ#1928707",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1928707"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-28493",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-28493"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
        }
      ],
      "release_date": "2021-02-01T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nFor the update to take effect, all applications using Jinja2 must be restarted.",
          "product_ids": [
            "AppStream-8.5.0.GA:python-jinja2-0:2.10.1-3.el8.src",
            "AppStream-8.5.0.GA:python3-jinja2-0:2.10.1-3.el8.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:4161"
        },
        {
          "category": "workaround",
          "details": "If using the jinja2 library as a developer, this flaw can be mitigated by not using the vulnerable urlize() filter, and instead, using Markdown to format user content.",
          "product_ids": [
            "AppStream-8.5.0.GA:python-jinja2-0:2.10.1-3.el8.src",
            "AppStream-8.5.0.GA:python3-jinja2-0:2.10.1-3.el8.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.5.0.GA:python-jinja2-0:2.10.1-3.el8.src",
            "AppStream-8.5.0.GA:python3-jinja2-0:2.10.1-3.el8.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "python-jinja2: ReDoS vulnerability in the urlize filter"
    }
  ]
}