{"id":"UBUNTU-CVE-2026-26963","details":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.","modified":"2026-05-20T16:12:11.739201791Z","published":"2026-02-20T00:16:00Z","upstream":["CVE-2026-26963"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-26963"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-26963"},{"type":"REPORT","url":"https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885"},{"type":"REPORT","url":"https://github.com/cilium/cilium/pull/42892"},{"type":"REPORT","url":"https://github.com/cilium/cilium/releases/tag/v1.18.6"},{"type":"REPORT","url":"https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3"}],"affected":[{"package":{"name":"golang-github-cilium-ebpf","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/golang-github-cilium-ebpf?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.0-1","0.6.2-2","0.7.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.7.0-1","binary_name":"golang-github-cilium-ebpf-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26963.json"}},{"package":{"name":"golang-github-cilium-ebpf","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/golang-github-cilium-ebpf?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.1-1","0.11.0-1","0.11.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.11.0-2","binary_name":"golang-github-cilium-ebpf-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26963.json"}},{"package":{"name":"golang-github-cilium-ebpf","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/golang-github-cilium-ebpf?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.11.0-2","binary_name":"golang-github-cilium-ebpf-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26963.json"}},{"package":{"name":"golang-github-cilium-ebpf","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-github-cilium-ebpf?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.0-2","0.17.3+ds1-4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.17.3+ds1-4","binary_name":"golang-github-cilium-ebpf-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26963.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}