{"id":"CVE-2023-41333","aliases":["BIT-cilium-2023-41333","BIT-cilium-operator-2023-41333","BIT-cilium-proxy-2023-41333","BIT-hubble-2023-41333","BIT-hubble-relay-2023-41333","BIT-hubble-ui-2023-41333","BIT-hubble-ui-backend-2023-41333","EUVD-2023-2423","GHSA-4xp2-w642-7mcx","GO-2023-2080"],"status":"published","title":"Bypass of namespace restrictions in CiliumNetworkPolicy","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","severity":{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00482,"percentile":0.41857,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-306"],"published":"2023-09-26T20:19:34Z","modified":"2026-10-28T02:30:51Z","fixes":[{"ecosystem":"Go","package":"github.com/cilium/cilium","fixed_in":["1.14.2","1.13.7","1.12.14"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"cilium","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"cilium-operator","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"cilium-proxy","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"hubble","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"hubble-relay","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"hubble-ui","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"hubble-ui-backend","fixed_in":["1.12.14","1.13.7","1.14.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.13.0"},{"fixed":"1.13.7"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.14"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"cilium","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"cilium-operator","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"cilium-proxy","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"hubble","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"hubble-relay","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"hubble-ui","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"hubble-ui-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"introduced":"1.13.0"},{"fixed":"1.13.7"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.14"},{"introduced":"1.13.0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.2"}]}]}],"products":[{"vendor":"cilium","product":"cilium"}],"references":[{"url":"https://github.com/cilium/cilium/security/advisories/GHSA-4xp2-w642-7mcx","tags":["x_refsource_CONFIRM","x_transferred","Mitigation","Patch","Third Party Advisory","advisory","web"]},{"url":"https://github.com/cilium/cilium/pull/28007","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","fix","web"]},{"url":"https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-41333","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-4xp2-w642-7mcx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41333.json","tags":["advisory"]},{"url":"https://github.com/cilium/cilium","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-41333","title":"Bypass of namespace restrictions in CiliumNetworkPolicy ","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n","status":"published","published":"2023-09-26T20:19:34.512Z","modified":"2024-09-23T20:32:01.851Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:35:18.88314Z"}],"euvd":[{"id":"EUVD-2023-2423","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n","status":"published","published":"2023-09-26T20:19:34Z","modified":"2024-09-23T20:32:01Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:28:16.146478Z"}],"ghsa":[{"id":"GHSA-4xp2-w642-7mcx","title":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy ","description":"### Impact\n\nAn attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces.\n\nBy using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic.\n\nThis attack requires API server access, as described in the [Kubernetes API Server Attacker](https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker) section of the Cilium Threat Model.\n\n### Patches\n\nThis issue was patched in https://github.com/cilium/cilium/pull/28007\n\nThis issue affects:\n\n- Cilium \u003c= v1.14.1\n- Cilium \u003c= v1.13.6\n- Cilium \u003c= v1.12.13\n\nThis issue has been resolved in:\n\n- Cilium v1.14.2\n- Cilium v1.13.7\n- Cilium v1.12.14\n\n### Workarounds\n\nAn admission webhook can be used to prevent the use of `endpointSelector`s that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n\n### Acknowledgements\nThe Cilium community has worked together with members of Palantir and Isovalent to prepare these mitigations. Special thanks to @odinuge for reporting this issue and @joestringer for the fix.\n\n### For more information\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).\n\nIf you think you have found a vulnerability in Cilium, we strongly encourage you to report it to our private security mailing list at [security@cilium.io](mailto:security@cilium.io) first, before disclosing it in any public forum. This is a private mailing list for Cilium's internal security team, and your report will be treated as top priority. ","status":"published","published":"2023-09-27T00:35:26Z","modified":"2023-11-06T05:01:53Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:37:14.234712Z"}],"nvd":[{"id":"CVE-2023-41333","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n","status":"published","published":"2023-09-27T15:19:30.163Z","modified":"2026-06-17T06:21:50.35Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:08:31.699785Z"}],"osv":[{"id":"CVE-2023-41333","title":"Bypass of namespace restrictions in CiliumNetworkPolicy ","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n","status":"published","published":"2023-09-26T20:19:34.512Z","modified":"2026-10-28T02:30:51.253630673Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:44:33.244128Z"},{"id":"GHSA-4xp2-w642-7mcx","title":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy ","description":"### Impact\n\nAn attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces.\n\nBy using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic.\n\nThis attack requires API server access, as described in the [Kubernetes API Server Attacker](https://docs.cilium.io/en/stable/security/threat-model/#kubernetes-api-server-attacker) section of the Cilium Threat Model.\n\n### Patches\n\nThis issue was patched in https://github.com/cilium/cilium/pull/28007\n\nThis issue affects:\n\n- Cilium \u003c= v1.14.1\n- Cilium \u003c= v1.13.6\n- Cilium \u003c= v1.12.13\n\nThis issue has been resolved in:\n\n- Cilium v1.14.2\n- Cilium v1.13.7\n- Cilium v1.12.14\n\n### Workarounds\n\nAn admission webhook can be used to prevent the use of `endpointSelector`s that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.\n\n### Acknowledgements\nThe Cilium community has worked together with members of Palantir and Isovalent to prepare these mitigations. Special thanks to @odinuge for reporting this issue and @joestringer for the fix.\n\n### For more information\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).\n\nIf you think you have found a vulnerability in Cilium, we strongly encourage you to report it to our private security mailing list at [security@cilium.io](mailto:security@cilium.io) first, before disclosing it in any public forum. This is a private mailing list for Cilium's internal security team, and your report will be treated as top priority. ","status":"published","published":"2023-09-27T00:35:26Z","modified":"2026-09-10T03:49:57.766721289Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H","level":"medium"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:46:37.528068Z"},{"id":"BIT-cilium-2023-41333","title":"Bypass of namespace restrictions in CiliumNetworkPolicy ","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-05-15T12:06:29.973Z","modified":"2026-09-08T08:45:56.219937583Z","updated_at":"2026-11-02T15:28:28.70813Z"},{"id":"BIT-cilium-operator-2023-41333","title":"Bypass of namespace restrictions in CiliumNetworkPolicy ","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-05-15T12:06:27.277Z","modified":"2026-09-08T08:45:52.978133157Z","updated_at":"2026-11-02T15:28:28.70813Z"},{"id":"BIT-cilium-proxy-2023-41333","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-07-01T11:11:52.397Z","modified":"2024-08-21T14:56:52.516625Z","updated_at":"2026-11-02T15:28:28.70813Z"},{"id":"BIT-hubble-2023-41333","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-06-04T09:43:48.804Z","modified":"2024-08-21T14:56:52.516625Z","updated_at":"2026-11-02T15:28:31.02759Z"},{"id":"BIT-hubble-relay-2023-41333","title":"Bypass of namespace restrictions in CiliumNetworkPolicy ","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-05-24T19:21:52.892Z","modified":"2026-09-08T08:48:23.165649118Z","updated_at":"2026-11-02T15:28:31.02759Z"},{"id":"BIT-hubble-ui-2023-41333","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-07-01T11:16:49.493Z","modified":"2024-08-21T14:56:52.516625Z","updated_at":"2026-11-02T15:28:31.02759Z"},{"id":"BIT-hubble-ui-backend-2023-41333","description":"Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.","status":"published","published":"2024-07-01T11:16:45.193Z","modified":"2024-08-21T14:56:52.516625Z","updated_at":"2026-11-02T15:28:31.02759Z"},{"id":"GO-2023-2080","title":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy in github.com/cilium/cilium","description":"Cilium vulnerable to bypass of namespace restrictions in CiliumNetworkPolicy in github.com/cilium/cilium","status":"published","published":"2024-08-21T14:30:18Z","modified":"2026-02-04T02:16:04.157526Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}