{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73456", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-08-12T16:45:03.510Z", "datePublished": "2026-09-16T18:54:59.526Z", "dateUpdated": "2026-09-16T18:54:59.526Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-09-16T18:54:59.526Z"}, "title": "Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.", "datePublic": "2026-09-09T18:52:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-94", "description": "CWE-94 Improper Control of Generation of Code ('Code Injection')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-242", "descriptions": [{"lang": "en", "value": "CAPEC-242 Code Injection"}]}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "platforms": ["710 Series", "720D Series", "720XP/722XPM Series", "750X Series", "7010TX Series", "7020R/R4 Series", "7130 Series running EOS", "7170 Series", "7050X3/X4 Series", "7060X/X2/X4/X5/X6 Series", "7260X/X3 Series", "7280R/R2/R3/R4 Series", "7300X/X3 Series", "7320X Series", "7358X4 Series", "7368X4 Series", "7388X5 Series", "7500R/R2/R3 Series", "7800R3/R4 Series", "7700R4 Series", "AWE 5000 Series", "AWE 7200R Series", "CloudEOS", "cEOS-lab", "vEOS-lab", "CloudVision eXchange", "virtual or physical appliance"], "versions": [{"status": "affected", "version": "4.36.0", "lessThanOrEqual": "4.36.1F", "changes": [{"at": "4.36.2F", "status": "unaffected"}], "versionType": "custom"}, {"status": "affected", "version": "4.35.0", "lessThanOrEqual": "4.35.5M", "changes": [{"at": "4.35.6M", "status": "unaffected"}], "versionType": "custom"}, {"status": "affected", "version": "4.34.2F", "lessThanOrEqual": "4.34.7M", "changes": [{"at": "4.34.8M", "status": "unaffected"}], "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.</p>"}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158", "tags": ["vendor-advisory"]}], "configurations": [{"lang": "en", "value": "In order to be vulnerable to CVE-2026-73456, gNPSI must be enabled and one of the following conditions must be met:\n\n\n\n1. A gNPSI transport is configured to perform TLS (server verification) and metadata authentication is enabled:\n\n\n\nswitch> show management api gnpsi\nTransport: t2\nEnabled: yes\nServer: running on port 7001\nSource: sflow\nListening VRF default: ::\nSSL profile: P2, TLS configured\nAuthentication username priority: x509-spiffe, metadata, x509-common-name\n\n\n\n2. Or mTLS is enabled with x509-common-name authentication configured:\n\n\n\nswitch> show management api gnpsi\nTransport: t2\nEnabled: yes\nServer: running on port 7001\nSource: sflow\nListening VRF default: ::\nSSL profile: P2, mutual TLS configured\nAuthentication username priority: x509-spiffe, x509-common-name\n\n\n\nSystems remain unaffected if gNPSI is not enabled (default configuration):\n\n\n\nswitch> show management api gnpsi\nEnabled: no transports enabled", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In order to be vulnerable to CVE-2026-73456, gNPSI must be enabled and one of the following conditions must be met:</p><p>1. A gNPSI transport is configured to perform TLS (server verification) and metadata authentication is enabled:</p><pre>switch&gt; show management api gnpsi\nTransport: t2\nEnabled: yes\nServer: running on port 7001\nSource: sflow\nListening VRF default: ::\nSSL profile: P2, TLS configured\nAuthentication username priority: x509-spiffe, metadata, x509-common-name</pre><p>2. Or mTLS is enabled with x509-common-name authentication configured:</p><pre>switch&gt; show management api gnpsi\nTransport: t2\nEnabled: yes\nServer: running on port 7001\nSource: sflow\nListening VRF default: ::\nSSL profile: P2, mutual TLS configured\nAuthentication username priority: x509-spiffe, x509-common-name</pre><p>Systems remain unaffected if gNPSI is not enabled (default configuration):</p><pre>switch&gt; show management api gnpsi\nEnabled: no transports enabled</pre>"}]}], "workarounds": [{"lang": "en", "value": "To secure the agent against CVE-2026-73456, configure the service to use mutual TLS and enable only x509-spiffe authentication:\n\n\n\nmanagement security\n ssl profile P1\n certificate server.crt key server.key\n trust certificate ca_client.crt\n chain certificate ca_signing.crt\n!\nmanagement api gnpsi\n transport grpc t2\n ssl profile P1\n port 7001\n authentication username priority x509-spiffe\n no disabled", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>To secure the agent against CVE-2026-73456, configure the service to use mutual TLS and enable only x509-spiffe authentication:</p><pre>management security\n ssl profile P1\n certificate server.crt key server.key\n trust certificate ca_client.crt\n chain certificate ca_signing.crt\n!\nmanagement api gnpsi\n transport grpc t2\n ssl profile P1\n port 7001\n authentication username priority x509-spiffe\n no disabled</pre>"}]}], "solutions": [{"lang": "en", "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73456 has been fixed in the following releases:\n\n * 4.36.2F and later releases in the 4.36.x train\n * 4.35.6M and later releases in the 4.35.x train\n * 4.34.8M and later releases in the 4.34.x train", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73456 has been fixed in the following releases:</p><ul><li>4.36.2F and later releases in the 4.36.x train</li><li>4.35.6M and later releases in the 4.35.x train</li><li>4.34.8M and later releases in the 4.34.x train</li></ul>"}]}], "credits": [{"lang": "en", "value": "This issue was discovered internally by Arista.", "type": "finder"}], "source": {"defect": ["1823956"], "advisory": "158", "discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}, "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 10, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "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": "CRITICAL", "baseScore": 9.2, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}]}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["710 Series", "720D Series", "720XP/722XPM Series", "750X Series", "7010TX Series", "7020R/R4 Series", "7130 Series running EOS", "7170 Series", "7050X3/X4 Series", "7060X/X2/X4/X5/X6 Series", "7260X/X3 Series", "7280R/R2/R3/R4 Series", "7300X/X3 Series", "7320X Series", "7358X4 Series", "7368X4 Series", "7388X5 Series", "7500R/R2/R3 Series", "7800R3/R4 Series", "7700R4 Series", "AWE 5000 Series", "AWE 7200R Series", "CloudEOS", "cEOS-lab", "vEOS-lab", "CloudVision eXchange", "virtual or physical appliance"], "product": "EOS", "vendor": "Arista Networks", "versions": [{"changes": [{"at": "4.36.2F", "status": "unaffected"}], "lessThanOrEqual": "4.36.1F", "status": "affected", "version": "4.36.0", "versionType": "custom"}, {"changes": [{"at": "4.35.6M", "status": "unaffected"}], "lessThanOrEqual": "4.35.5M", "status": "affected", "version": "4.35.0", "versionType": "custom"}, {"changes": [{"at": "4.34.8M", "status": "unaffected"}], "lessThanOrEqual": "4.34.7M", "status": "affected", "version": "4.34.2F", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch."}], "id": "CVE-2026-73456", "lastModified": "2026-09-16T19:17:32.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "source": "psirt@arista.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.2, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "psirt@arista.com", "type": "Secondary"}]}, "published": "2026-09-16T19:17:32.270", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "psirt@arista.com", "type": "Secondary"}]}

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