{"id":"CVE-2023-30851","aliases":["GHSA-2h44-x2wx-49f4","BIT-cilium-2023-30851","BIT-cilium-operator-2023-30851","BIT-cilium-proxy-2023-30851","BIT-hubble-2023-30851","BIT-hubble-relay-2023-30851","BIT-hubble-ui-2023-30851","BIT-hubble-ui-backend-2023-30851","GO-2023-1785"],"title":"Potential HTTP policy bypass when using header rules in Cilium","summary":"Potential HTTP policy bypass when using header rules in Cilium","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","vendor":"cilium","product":"github.com/cilium/cilium","ecosystem":"go","affected":["github.com/cilium/cilium < 1.11.16","github.com/cilium/cilium >= 1.12.0, < 1.12.9","github.com/cilium/cilium >= 1.13.0, < 1.13.2"],"patched":["github.com/cilium/cilium 1.11.16","github.com/cilium/cilium 1.12.9","github.com/cilium/cilium 1.13.2"],"published":"2023-05-22","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:54.485621303Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-2h44-x2wx-49f4","references":[{"url":"https://github.com/cilium/cilium/security/advisories/GHSA-2h44-x2wx-49f4"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-30851"},{"url":"https://github.com/cilium/cilium"},{"url":"https://github.com/cilium/cilium/releases/tag/v1.11.16"},{"url":"https://github.com/cilium/cilium/releases/tag/v1.12.9"},{"url":"https://github.com/cilium/cilium/releases/tag/v1.13.2"}],"tags":["osv","go"],"epss":0.00655,"epssPercentile":0.49987,"ingestedAt":"2026-09-12T03:13:01.745Z","slug":"CVE-2023-30851","body":"## Overview\n\n### Impact\n\nThis issue only impacts users who:\n\n- Have a HTTP policy that applies to multiple `toEndpoints` AND\n- Have an allow-all rule in place that affects only one of those endpoints\n\nIn such cases, a wildcard rule will be appended to the set of HTTP rules, which could cause bypass of HTTP policies.\n\n### Patches\n\nThis issue has been patched in Cilium 1.11.16, 1.12.9, and 1.13.2.\n\n### Workarounds\n\nRewrite HTTP rules for each endpoint separately. For example, if the initial rule looks like:\n\n```\n  egress:\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: echo\n        - matchLabels:\n            k8s:kind: example\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n```\n\nIt should be rewritten to:\n \n```\n  egress:\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: echo\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: example\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n```     \n\n### Acknowledgements\n\nThe Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @jrajahalme for investigating and fixing the issue.\n\n### For more information\n\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\nAs usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: [security@cilium.io](mailto:security@cilium.io) - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.\n\n\n## Affected packages\n\n- `github.com/cilium/cilium < 1.11.16`\n- `github.com/cilium/cilium >= 1.12.0, < 1.12.9`\n- `github.com/cilium/cilium >= 1.13.0, < 1.13.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/cilium/cilium 1.11.16`\n- `github.com/cilium/cilium 1.12.9`\n- `github.com/cilium/cilium 1.13.2`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}