{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33923","assignerOrgId":"bec8025f-a851-46e5-b3a3-058e6b0aa23c","state":"PUBLISHED","assignerShortName":"Nozomi","dateReserved":"2026-03-24T16:06:11.951Z","datePublished":"2026-10-29T10:46:27.450Z","dateUpdated":"2026-10-29T12:36:53.310Z"},"containers":{"cna":{"providerMetadata":{"orgId":"bec8025f-a851-46e5-b3a3-058e6b0aa23c","shortName":"Nozomi","dateUpdated":"2026-10-29T10:46:27.450Z"},"title":"Update bundle signature bypass in Guardian/CMC before 26.4.0","datePublic":"2026-10-29T07:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-186","descriptions":[{"lang":"en","value":"CAPEC-186 Malicious Software Update"}]}],"affected":[{"vendor":"Nozomi Networks","product":"Guardian","versions":[{"status":"affected","version":"0","lessThan":"26.4.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"vendor":"Nozomi Networks","product":"CMC","versions":[{"status":"affected","version":"0","lessThan":"26.4.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nozomi_networks:guardian:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"26.4.0"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nozomi_networks:cmc:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"26.4.0"}]}]}],"descriptions":[{"lang":"en","value":"A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance.","supportingMedia":[{"type":"text/html","base64":false,"value":"A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance."}]}],"references":[{"url":"https://security.nozominetworks.com/NN-2026:21-01"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","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":"HIGH","baseScore":7.5,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.2,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"}}],"workarounds":[{"lang":"en","value":"Use internal firewall features to limit access to the web management interface.","supportingMedia":[{"type":"text/html","base64":false,"value":"Use internal firewall features to limit access to the web management interface.<br>"}]},{"lang":"en","value":"Review all accounts with administrative privileges and delete unnecessary ones.","supportingMedia":[{"type":"text/html","base64":false,"value":"Review all accounts with administrative privileges and delete unnecessary ones.<br>"}]},{"lang":"en","value":"Install update bundles only when they come from trusted Nozomi Networks sources.","supportingMedia":[{"type":"text/html","base64":false,"value":"Install update bundles only when they come from trusted Nozomi Networks sources.<br>"}]}],"solutions":[{"lang":"en","value":"Upgrade to v26.4.0 or later.","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to v26.4.0 or later.<br>"}]}],"credits":[{"lang":"en","value":"This issue was found by Andrea Palanca of Nozomi Networks Product Security team during an internal investigation.","type":"finder"}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-33923","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-29T12:19:57.938573Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-29T12:36:53.310Z"}}]}}