CVE-2026-73460

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73460", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-08-12T16:45:03.511Z", "datePublished": "2026-09-15T23:20:43.813Z", "dateUpdated": "2026-09-16T19:35:40.181Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-09-15T23:20:43.813Z"}, "title": "Security Advisory 0160", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-272", "descriptions": [{"lang": "en", "value": "CAPEC-272 Protocol Manipulation"}]}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "versions": [{"status": "affected", "version": "4.36.0", "lessThanOrEqual": "4.36.1F", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160", "name": "Security Advisory 0160", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 6.1, "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7, "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}}], "configurations": [{"lang": "en", "value": "In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.\n\n\n\nswitch(config-router-isis)#show active\nrouter isis 1\n\u00a0\u00a0\u00a0net 49.0001.1111.1111.1001.00\n\u00a0\u00a0\u00a0graceful-restart\n\n\n\nswitch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n\u00a0\u00a0System ID: 1111.1111.1001\n\u00a0\u00a0Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n\u00a0\u00a0State: Graceful Restart disabled during startup\n\u00a0\u00a0T1 : 3s\n\u00a0\u00a0T2 (level-1) : 30s/not running\n\u00a0\u00a0T2 (level-2) : 30s/not running\n\u00a0\u00a0T3 : not running\n\u00a0\u00a0System ID\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Type\u00a0 \u00a0 Interface\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Restart Capable \u00a0 Status\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a01111.1111.1002 \u00a0 \u00a0 L1\u00a0 \u00a0 \u00a0 Ethernet1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Yes \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Running\u00a0 \n\n\n\n\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.</p><pre>switch(config-router-isis)#show active\nrouter isis 1\n&nbsp;&nbsp;&nbsp;net 49.0001.1111.1111.1001.00\n&nbsp;&nbsp;&nbsp;graceful-restart<br><br><pre>switch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n&nbsp;&nbsp;System ID: 1111.1111.1001\n&nbsp;&nbsp;Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n&nbsp;&nbsp;State: Graceful Restart disabled during startup\n&nbsp;&nbsp;T1 : 3s\n&nbsp;&nbsp;T2 (level-1) : 30s/not running\n&nbsp;&nbsp;T2 (level-2) : 30s/not running\n&nbsp;&nbsp;T3 : not running\n&nbsp;&nbsp;System ID&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Type&nbsp; &nbsp; Interface&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Restart Capable &nbsp; Status&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;1111.1111.1002 &nbsp; &nbsp; L1&nbsp; &nbsp; &nbsp; Ethernet1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Yes &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Running&nbsp; </pre></pre><p>If IS-IS graceful-restart is not enabled, there is no exposure to this issue.</p>"}]}], "workarounds": [{"lang": "en", "value": "No workaround is available for this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>No workaround is available for this issue.</p>"}]}], "solutions": [{"lang": "en", "value": "The recommended resolution is to upgrade to a fixed software version.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The recommended resolution is to upgrade to a fixed software version.</p>"}]}], "credits": [{"lang": "en", "value": "This issue was discovered internally by Arista and the company is not aware of any malicious uses of these issues in customer networks.", "type": "finder"}], "source": {"advisory": "0160", "discovery": "UNKNOWN", "defects": ["BUG1840562"]}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-16T19:35:29.181267Z", "id": "CVE-2026-73460", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-16T19:35:40.181Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Security Advisory 0160", "source": {"defects": ["BUG1840562"], "advisory": "0160", "discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered internally by Arista and the company is not aware of any malicious uses of these issues in customer networks."}], "impacts": [{"capecId": "CAPEC-272", "descriptions": [{"lang": "en", "value": "CAPEC-272 Protocol Manipulation"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "versions": [{"status": "affected", "version": "4.36.0", "versionType": "custom", "lessThanOrEqual": "4.36.1F"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "The recommended resolution is to upgrade to a fixed software version.", "supportingMedia": [{"type": "text/html", "value": "<p>The recommended resolution is to upgrade to a fixed software version.</p>", "base64": false}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160", "name": "Security Advisory 0160", "tags": ["vendor-advisory"]}], "workarounds": [{"lang": "en", "value": "No workaround is available for this issue.", "supportingMedia": [{"type": "text/html", "value": "<p>No workaround is available for this issue.</p>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "value": "<p>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.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization"}]}], "configurations": [{"lang": "en", "value": "In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.\n\n\n\nswitch(config-router-isis)#show active\nrouter isis 1\n\u00a0\u00a0\u00a0net 49.0001.1111.1111.1001.00\n\u00a0\u00a0\u00a0graceful-restart\n\n\n\nswitch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n\u00a0\u00a0System ID: 1111.1111.1001\n\u00a0\u00a0Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n\u00a0\u00a0State: Graceful Restart disabled during startup\n\u00a0\u00a0T1 : 3s\n\u00a0\u00a0T2 (level-1) : 30s/not running\n\u00a0\u00a0T2 (level-2) : 30s/not running\n\u00a0\u00a0T3 : not running\n\u00a0\u00a0System ID\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Type\u00a0 \u00a0 Interface\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Restart Capable \u00a0 Status\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a01111.1111.1002 \u00a0 \u00a0 L1\u00a0 \u00a0 \u00a0 Ethernet1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Yes \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Running\u00a0 \n\n\n\n\n\nIf IS-IS graceful-restart is not enabled, there is no exposure to this issue.", "supportingMedia": [{"type": "text/html", "value": "<p>In order to be vulnerable to CVE-2026-73460, the following condition must be met: IS-IS graceful-restart should be enabled.</p><pre>switch(config-router-isis)#show active\nrouter isis 1\n&nbsp;&nbsp;&nbsp;net 49.0001.1111.1111.1001.00\n&nbsp;&nbsp;&nbsp;graceful-restart<br><br><pre>switch#show isis graceful-restart\nIS-IS Instance: 1 VRF: default\n&nbsp;&nbsp;System ID: 1111.1111.1001\n&nbsp;&nbsp;Graceful Restart: Enabled, Graceful Restart Helper: Enabled\n&nbsp;&nbsp;State: Graceful Restart disabled during startup\n&nbsp;&nbsp;T1 : 3s\n&nbsp;&nbsp;T2 (level-1) : 30s/not running\n&nbsp;&nbsp;T2 (level-2) : 30s/not running\n&nbsp;&nbsp;T3 : not running\n&nbsp;&nbsp;System ID&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Type&nbsp; &nbsp; Interface&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Restart Capable &nbsp; Status&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;1111.1111.1002 &nbsp; &nbsp; L1&nbsp; &nbsp; &nbsp; Ethernet1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Yes &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Running&nbsp; </pre></pre><p>If IS-IS graceful-restart is not enabled, there is no exposure to this issue.</p>", "base64": false}]}], "providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-09-15T23:20:43.813Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-73460", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-16T19:35:29.181267Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-09-16T19:35:35.763Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-73460", "state": "PUBLISHED", "dateUpdated": "2026-09-15T23:20:43.813Z", "dateReserved": "2026-08-12T16:45:03.511Z", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "datePublished": "2026-09-15T23:20:43.813Z", "assignerShortName": "Arista"}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.36.0,4.36.1F]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "EOS", "source": "cna", "vendor": "Arista Networks"}, "product": "eos", "vendor": "arista"}], "created": "2026-09-16T18:15:15.025099+00:00", "title": "IS-IS Graceful Restart Premature Termination via Malformed PDU in Arista EOS", "updated": "2026-09-29T13:22:44.572448+00:00", "vendors": ["arista", "arista$PRODUCT$eos"]}