{"api_version":"1","generated_at":"2026-09-17T07:50:28+00:00","cve":"CVE-2026-73456","urls":{"html":"https://cve.report/CVE-2026-73456","api":"https://cve.report/api/cve/CVE-2026-73456.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-73456","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-73456"},"summary":{"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.","description":"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.","state":"PUBLISHED","assigner":"Arista","published_at":"2026-09-16 19:17:32","updated_at":"2026-09-17 04:18:00"},"problem_types":["CWE-94","CWE-94 CWE-94 Improper Control of Generation of Code ('Code 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73456","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Arista Networks","product":"EOS","version":"affected 4.36.0 4.36.1F custom","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"]},{"source":"CNA","vendor":"Arista Networks","product":"EOS","version":"affected 4.35.0 4.35.5M custom","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"]},{"source":"CNA","vendor":"Arista Networks","product":"EOS","version":"affected 4.34.2F 4.34.7M custom","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"]}],"timeline":[],"solutions":[{"source":"CNA","title":"","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","time":"","lang":"en"}],"workarounds":[{"source":"CNA","title":"","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","time":"","lang":"en"}],"exploits":[],"credits":[{"source":"CNA","value":"This issue was discovered internally by Arista.","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-73456","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-09-16T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-17T03:57:33.387Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"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"}]}],"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>"}],"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"}],"credits":[{"lang":"en","type":"finder","value":"This issue was discovered internally by Arista."}],"datePublic":"2026-09-09T18:52:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>"}],"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."}],"impacts":[{"capecId":"CAPEC-242","descriptions":[{"lang":"en","value":"CAPEC-242 Code Injection"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.2,"baseSeverity":"CRITICAL","exploitMaturity":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","description":"CWE-94 Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T18:54:59.526Z","orgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","shortName":"Arista"},"references":[{"tags":["vendor-advisory"],"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>"}],"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"}],"source":{"advisory":"158","defect":["1823956"],"discovery":"INTERNAL"},"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.","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>"}],"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"}],"x_generator":{"engine":"Vulnogram 1.0.5"}}},"cveMetadata":{"assignerOrgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","assignerShortName":"Arista","cveId":"CVE-2026-73456","datePublished":"2026-09-16T18:54:59.526Z","dateReserved":"2026-08-12T16:45:03.510Z","dateUpdated":"2026-09-17T03:57:33.387Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 19:17:32","lastModifiedDate":"2026-09-17 04:18:00","problem_types":["CWE-94","CWE-94 CWE-94 Improper Control of Generation of Code ('Code Injection')"],"metrics":{"cvssMetricV40":[{"source":"psirt@arista.com","type":"Secondary","cvssData":{"version":"4.0","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","baseScore":9.2,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"psirt@arista.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":10,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-16T00:00:00+00:00","id":"CVE-2026-73456","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"73456","Ordinal":"1","Title":"Under certain circumstances, an unauthenticated gNPSI client can","CVE":"CVE-2026-73456","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"73456","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Under certain circumstances, an unauthenticated gNPSI client can"}]}}}