{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-66787 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-66787 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-66787 is a high-severity vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.16, published on 20 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-66787 and fix it if it is affected.\n\nWhat it is: CVE-2026-66787 is a high-severity vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.16, published on 20 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-66787 in the wild and no public exploit code.\n\nAffected product: Red Hat Advanced Cluster Management for Kubernetes 2.16. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-66787/ (Markdown: https://insights.sbomify.com/CVE-2026-66787/index.md)","id":"CVE-2026-66787","markdown":"https://insights.sbomify.com/CVE-2026-66787/index.md","name":"CVE-2026-66787","record":{"aliases":["GHSA-7fh9-j94v-w42j"],"analysis":{"component_type":"cloud_service","fix_type":"patch","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Kubernetes cluster management","requires_auth":"high_privilege","summary":"A compromised spoke cluster can spoof DNS entries to redirect cross-cluster traffic, enabling Man-in-the-Middle attacks and data manipulation.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"description":"A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluster can exploit this by creating EndpointSlices with attacker-controlled IP addresses, causing other clusters' lighthouse DNS to redirect legitimate service traffic to malicious endpoints. This enables a remote attacker to conduct transparent Man-in-the-Middle (MITM) attacks on cross-cluster service communications, potentially leading to unauthorized information disclosure and data manipulation.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses","id":"CVE-2026-66787","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label","id":"CVE-2026-66788"},"packages":[],"prev":{"headline":"Submariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subnets","id":"CVE-2026-66786"},"products":["Red Hat Advanced Cluster Management for Kubernetes 2.16","Red Hat Advanced Cluster Management for Kubernetes 2.17"],"published":"2026-08-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Red Hat"]},"summary":"A compromised spoke cluster can spoof DNS entries to redirect cross-cluster traffic, enabling Man-in-the-Middle attacks and data manipulation.","url":"https://insights.sbomify.com/CVE-2026-66787/"}