{"id":"CVE-2026-92542","state":"PUBLISHED","title":"Blind VXLAN injection into encrypted overlay networks from cluster peer","description":"The firewall rules which mark VXLAN datagrams for encryption indiscriminately match both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes. Any packet sent from the host network namespace of a Linux Swarm node is encrypted with the overlay-network IPsec parameters which meets the following criteria:\n\n- UDP datagram\n- Destination port is the Swarm data-path port\n- Datagram starts with a VXLAN header for the VNI of an encrypted overlay network which any running container on the node is connected to","publishedAt":"2026-10-07T16:42:20.998Z","updatedAt":"2026-10-07T20:30:49.884Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","source":"Docker"},"assigner":"Docker","products":["Docker Docker Engine","Docker Docker Engine overlay network driver","Moby Moby overlay network driver"],"affected":[{"vendor":"Docker","product":"Docker Engine","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"25.0.19","versionType":"semver"},{"version":"26.0.0","status":"affected","lessThan":"29.8.2","versionType":"semver"}],"platforms":["Linux"]},{"vendor":"Docker","product":"Docker Engine overlay network driver","packageName":"github.com/docker/docker/libnetwork/drivers/overlay","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"v25.0.19","versionType":"semver"},{"version":"v26.0.0","status":"affected","lessThan":"*","versionType":"semver"}],"platforms":["Linux"]},{"vendor":"Moby","product":"Moby overlay network driver","packageName":"github.com/moby/moby/v2/daemon/libnetwork/drivers/overlay","defaultStatus":"unaffected","versions":[{"version":"v2.0.0-beta.0","status":"affected","lessThan":"v2.0.0-beta.25","versionType":"semver"}],"platforms":["Linux"]}],"references":["https://github.com/moby/moby/security/advisories/GHSA-6m9p-4h64-m6vh"],"weaknesses":["CWE-290"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/92xxx/CVE-2026-92542.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-92542","state":"PUBLISHED","datePublished":"2026-10-07T16:42:20.998Z","dateUpdated":"2026-10-07T20:30:49.884Z","assignerShortName":"Docker","assignerOrgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateReserved":"2026-09-16T13:00:30.172Z"},"containers":{"cna":{"title":"Blind VXLAN injection into encrypted overlay networks from cluster peer","descriptions":[{"lang":"en","value":"The firewall rules which mark VXLAN datagrams for encryption indiscriminately match both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes. Any packet sent from the host network namespace of a Linux Swarm node is encrypted with the overlay-network IPsec parameters which meets the following criteria:\n\n- UDP datagram\n- Destination port is the Swarm data-path port\n- Datagram starts with a VXLAN header for the VNI of an encrypted overlay network which any running container on the node is connected to"}],"affected":[{"vendor":"Docker","product":"Docker Engine","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"25.0.19","versionType":"semver"},{"version":"26.0.0","status":"affected","lessThan":"29.8.2","versionType":"semver"}],"platforms":["Linux"]},{"vendor":"Docker","product":"Docker Engine overlay network driver","packageName":"github.com/docker/docker/libnetwork/drivers/overlay","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"v25.0.19","versionType":"semver"},{"version":"v26.0.0","status":"affected","lessThan":"*","versionType":"semver"}],"platforms":["Linux"]},{"vendor":"Moby","product":"Moby overlay network driver","packageName":"github.com/moby/moby/v2/daemon/libnetwork/drivers/overlay","defaultStatus":"unaffected","versions":[{"version":"v2.0.0-beta.0","status":"affected","lessThan":"v2.0.0-beta.25","versionType":"semver"}],"platforms":["Linux"]}],"references":[{"url":"https://github.com/moby/moby/security/advisories/GHSA-6m9p-4h64-m6vh","tags":["vendor-advisory"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","baseScore":6.9,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","exploitMaturity":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"providerMetadata":{"shortName":"Docker","orgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateUpdated":"2026-10-07T16:42:20.998Z"},"configurations":[{"lang":"en","value":"Linux Swarm nodes participating in an encrypted overlay network"}],"impacts":[{"descriptions":[{"lang":"en","value":"An unprivileged user on a Swarm node can trivially inject forged Ethernet frames into an encrypted overlay network on another node."}]}],"workarounds":[{"lang":"en","value":"Block userspace processes from sending UDP packets to the Swarm data-path port.\n\niptables -I OUTPUT -p udp --dport \"$(docker info --format '{{.Swarm.Cluster.DataPathPort}}')\" -m owner --socket-exists -j DROP"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-07T20:30:27.853237Z","id":"CVE-2026-92542","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","type":"CWE","lang":"en","description":"CWE-290 Authentication Bypass by Spoofing"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-07T20:30:49.884Z"}}]}}}