{"answers":{"affected":"3 open source packages ship an affected version, including github.com/basekick-labs/arc.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55678 exists.","fix":"Upgrade github.com/basekick-labs/arc to 0.0.0-20260615160325-38402ad2ebdd or later.","what":"CVE-2026-55678 is a medium-severity missing authorization vulnerability in Basekick-Labs arc, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-55678 and fix it if it is affected.\n\nWhat it is: CVE-2026-55678 is a medium-severity missing authorization vulnerability in Basekick-Labs arc, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55678 exists.\n\nAffected packages and fixed versions:\n- github.com/basekick-labs/arc (Go): affected all versions; fixed in 0.0.0-20260615160325-38402ad2ebdd\n- github.com/basekick-labs/arc (Go): affected all versions; fixed in 0.0.0-20260615160325-38402ad2ebdd\n- github.com/basekick-labs/arc (Go): affected all versions; fixed in 0.0.0-20260615160325-38402ad2ebdd\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-2026-55678/ (Markdown: https://insights.sbomify.com/CVE-2026-55678/index.md)","id":"CVE-2026-55678","markdown":"https://insights.sbomify.com/CVE-2026-55678/index.md","name":"CVE-2026-55678","record":{"aliases":["GHSA-p378-jp5r-gpgw","GO-2026-6322"],"analysis":{"component_type":"database","fix_type":"upgrade","impacts":["privilege_escalation","data_read","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Arc time-series database","requires_auth":"none","summary":"Unauthenticated attackers can join Arc Enterprise clusters if shared_secret is unset, allowing them to intercept data, modify cluster state, and execute operations as trusted nodes.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-287","name":"Improper Authentication"},{"id":"CWE-284","name":"Improper Access Control"}],"description":"Arc is an open, SQL-native time-series database for telemetry. From 26.02.1 until 26.06.2, Arc Enterprise clustering accepts cluster join requests without authentication when cluster.enabled is true but cluster.shared_secret is not configured. The defaults in internal/config/config.go set cluster.enabled to false, cluster.cluster_name to arc-cluster, cluster.coordinator_addr to :9100, cluster.shared_secret to an empty value, and cluster.tls_enabled to false, while cmd/arc/main.go requires cluster.shared_secret only when cluster.replication_enabled is true. JoinRequest in internal/cluster/protocol/messages.go accepts attacker-controlled node_id, role, raft_addr, api_addr, and coord_addr values, plus optional auth_nonce, auth_timestamp, and auth_hmac fields. The join path in internal/cluster/coordinator.go validates HMAC authentication only when the configured shared secret is non-empty and otherwise proceeds after only the cluster-name check. An accepted node is marked healthy, added as a Raft voter or registered locally, and becomes available through internal/cluster/registry.go to the routing logic in internal/cluster/router.go. The forwardRequest path in internal/cluster/router.go builds its target from node.APIAddress and copies Authorization and x-api-key headers with the request, so a rogue node selected for a forwarded query or write can receive authentication headers, request bodies, database and measurement names, and operational metadata. Heartbeat in internal/cluster/protocol/messages.go also lacks HMAC fields, and internal/cluster/coordinator.go updates node state from supplied node_id and state values without authentication. An unauthenticated network attacker who can reach the coordinator port and knows the cluster name can therefore become a trusted cluster node, mutate cluster membership, be submitted as a Raft voter, intercept topology-dependent forwarded requests, divert or forge operations, and blackhole or delay traffic. The default standalone configuration is not reachable because cluster.enabled is false, but Enterprise cluster deployments with clustering enabled and no shared secret are affected. This issue is fixed in version 26.06.2.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Arc: Unauthenticated cluster node admission when `cluster.shared_secret` is unset","id":"CVE-2026-55678","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"WeGIA: Pre-auth Installer Injection Chain Enables Command Execution and Arbitrary PHP Code Injection","id":"CVE-2026-55679"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260615160325-38402ad2ebdd"],"introduced":["0"],"last_affected":[],"package":"github.com/basekick-labs/arc","purl":null,"source":"GHSA-p378-jp5r-gpgw"},{"ecosystem":"Go","fixed":["0.0.0-20260615160325-38402ad2ebdd"],"introduced":["0"],"last_affected":[],"package":"github.com/basekick-labs/arc","purl":"pkg:golang/github.com/basekick-labs/arc","source":"GHSA-p378-jp5r-gpgw"},{"ecosystem":"Go","fixed":["0.0.0-20260615160325-38402ad2ebdd"],"introduced":["0"],"last_affected":[],"package":"github.com/basekick-labs/arc","purl":"pkg:golang/github.com/basekick-labs/arc","source":"GO-2026-6322"}],"prev":{"headline":"Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files","id":"CVE-2026-55677"},"products":["arc"],"published":"2026-08-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-01","vendors":["Basekick-Labs"]},"summary":"Unauthenticated attackers can join Arc Enterprise clusters if shared_secret is unset, allowing them to intercept data, modify cluster state, and execute operations as trusted nodes.","url":"https://insights.sbomify.com/CVE-2026-55678/"}