{
  "document": {
    "category": "security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "publisher": {
      "category": "vendor",
      "contact_details": "support@arista.com",
      "name": "Arista PSIRT",
      "namespace": "https://www.arista.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Security advisory 160 canonical URL",
        "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160"
      }
    ],
    "title": "Security Advisory 160",
    "tracking": {
      "current_release_date": "2026-09-17T11:48:14Z",
      "generator": {
        "engine": {
          "name": "Arista Networks SecEng Service CSAF Generator"
        }
      },
      "id": "Arista Networks Security Advisory 160",
      "initial_release_date": "2026-09-17T11:48:14Z",
      "revision_history": [
        {
          "date": "2026-09-17T11:48:14Z",
          "number": "1",
          "summary": "Document created"
        }
      ],
      "status": "interim",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.2",
                    "product": {
                      "name": "EOS version 4.36.2",
                      "product_id": "CSAFPID-0"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.34.8",
                    "product": {
                      "name": "EOS version 4.34.8",
                      "product_id": "CSAFPID-1"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.36.0",
                    "product": {
                      "name": "EOS version 4.36.0",
                      "product_id": "CSAFPID-5"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.35.6",
                    "product": {
                      "name": "EOS version 4.35.6",
                      "product_id": "CSAFPID-3"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.31.0",
                    "product": {
                      "name": "EOS version 4.31.0",
                      "product_id": "CSAFPID-2"
                    }
                  },
                  {
                    "category": "product_version",
                    "name": "EOS version 4.33.10",
                    "product": {
                      "name": "EOS version 4.33.10",
                      "product_id": "CSAFPID-4"
                    }
                  }
                ],
                "category": "product_name",
                "name": "EOS"
              }
            ],
            "category": "product_family",
            "name": "Software Products"
          }
        ],
        "category": "vendor",
        "name": "Arista Networks, Inc."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-73446",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1840504"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "#### CVE-2026-73446\n\nIn order to be vulnerable to CVE-2026-73446, the following condition must be met:\n\nIS-IS must be enabled on a broadcast (LAN) interface AND there should be an active IS-IS adjacency on that interface:\n\nIf IS-IS is not configured OR IS-IS is configured only on point-to-point interfaces, there is no exposure to this issue.\n\n#### CVE-2026-73459\n\nIn order to be vulnerable to CVE-2026-73459, the following condition must be met:\n\nIS-IS should be configured.\n\nIf IS-IS is not configured, there is no exposure to this issue.\n\n#### CVE-2026-73460\n\nIn order to be vulnerable to CVE-2026-73460, the following condition must be met:\n\nIS-IS graceful-restart should be enabled.\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.",
          "title": "1840504: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-2"
        ],
        "fixed": [
          "CSAFPID-0",
          "CSAFPID-1",
          "CSAFPID-3",
          "CSAFPID-4"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE URL",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-73446"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.33.10",
          "product_ids": [
            "CSAFPID-4"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.34.8",
          "product_ids": [
            "CSAFPID-1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.35.6",
          "product_ids": [
            "CSAFPID-3"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.2",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.31.0",
          "product_ids": [
            "CSAFPID-2"
          ]
        },
        {
          "category": "mitigation",
          "details": "### CVE-2026-73446\n\nThe workaround is to configure the IS-IS interface type as point-to-point instead of the default broadcast (LAN). This must be done on both endpoints of the link.\n\nChanging the IS-IS interface type from LAN to point-to-point may result in temporary adjacency flaps on the specified link, potentially causing transient traffic loss.\n\nThe above mitigation does not work in cases where the LAN interface supports multiple IS-IS adjacencies. In such instances, the peerings must be partitioned across separate point-to-point interfaces to ensure each interface maps to a single IS-IS adjacency.\n\n### CVE-2026-73459 and CVE-2026-73460\n\nNo workaround is available for those issues."
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-4",
            "CSAFPID-3",
            "CSAFPID-0",
            "CSAFPID-2",
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-73446"
    },
    {
      "cve": "CVE-2026-73460",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1840562"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "#### CVE-2026-73446\n\nIn order to be vulnerable to CVE-2026-73446, the following condition must be met:\n\nIS-IS must be enabled on a broadcast (LAN) interface AND there should be an active IS-IS adjacency on that interface:\n\nIf IS-IS is not configured OR IS-IS is configured only on point-to-point interfaces, there is no exposure to this issue.\n\n#### CVE-2026-73459\n\nIn order to be vulnerable to CVE-2026-73459, the following condition must be met:\n\nIS-IS should be configured.\n\nIf IS-IS is not configured, there is no exposure to this issue.\n\n#### CVE-2026-73460\n\nIn order to be vulnerable to CVE-2026-73460, the following condition must be met:\n\nIS-IS graceful-restart should be enabled.\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.",
          "title": "1840562: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-5"
        ],
        "fixed": [
          "CSAFPID-0"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE URL",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-73460"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.2",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.36.0",
          "product_ids": [
            "CSAFPID-5"
          ]
        },
        {
          "category": "mitigation",
          "details": "### CVE-2026-73446\n\nThe workaround is to configure the IS-IS interface type as point-to-point instead of the default broadcast (LAN). This must be done on both endpoints of the link.\n\nChanging the IS-IS interface type from LAN to point-to-point may result in temporary adjacency flaps on the specified link, potentially causing transient traffic loss.\n\nThe above mitigation does not work in cases where the LAN interface supports multiple IS-IS adjacencies. In such instances, the peerings must be partitioned across separate point-to-point interfaces to ensure each interface maps to a single IS-IS adjacency.\n\n### CVE-2026-73459 and CVE-2026-73460\n\nNo workaround is available for those issues."
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-5",
            "CSAFPID-0"
          ]
        }
      ],
      "title": "CVE-2026-73460"
    },
    {
      "cve": "CVE-2026-73459",
      "id": {
        "system_name": "Arista Bug ID",
        "text": "1840507"
      },
      "notes": [
        {
          "category": "description",
          "text": "On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU can cause the legitimate LSP to be unexpectedly purged from the IS-IS link-state database. This may result in traffic loss.",
          "title": "CVE Description"
        },
        {
          "category": "other",
          "text": "#### CVE-2026-73446\n\nIn order to be vulnerable to CVE-2026-73446, the following condition must be met:\n\nIS-IS must be enabled on a broadcast (LAN) interface AND there should be an active IS-IS adjacency on that interface:\n\nIf IS-IS is not configured OR IS-IS is configured only on point-to-point interfaces, there is no exposure to this issue.\n\n#### CVE-2026-73459\n\nIn order to be vulnerable to CVE-2026-73459, the following condition must be met:\n\nIS-IS should be configured.\n\nIf IS-IS is not configured, there is no exposure to this issue.\n\n#### CVE-2026-73460\n\nIn order to be vulnerable to CVE-2026-73460, the following condition must be met:\n\nIS-IS graceful-restart should be enabled.\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.",
          "title": "1840507: Required Config for Exploitation"
        }
      ],
      "product_status": {
        "first_affected": [
          "CSAFPID-5"
        ],
        "fixed": [
          "CSAFPID-0"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "MITRE URL",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-73459"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in EOS version 4.36.2",
          "product_ids": [
            "CSAFPID-0"
          ]
        },
        {
          "category": "none_available",
          "details": "Not fixed in EOS version 4.36.0",
          "product_ids": [
            "CSAFPID-5"
          ]
        },
        {
          "category": "mitigation",
          "details": "### CVE-2026-73446\n\nThe workaround is to configure the IS-IS interface type as point-to-point instead of the default broadcast (LAN). This must be done on both endpoints of the link.\n\nChanging the IS-IS interface type from LAN to point-to-point may result in temporary adjacency flaps on the specified link, potentially causing transient traffic loss.\n\nThe above mitigation does not work in cases where the LAN interface supports multiple IS-IS adjacencies. In such instances, the peerings must be partitioned across separate point-to-point interfaces to ensure each interface maps to a single IS-IS adjacency.\n\n### CVE-2026-73459 and CVE-2026-73460\n\nNo workaround is available for those issues."
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-5",
            "CSAFPID-0"
          ]
        }
      ],
      "title": "CVE-2026-73459"
    }
  ]
}