{"id":"CVE-2026-45039","state":"PUBLISHED","title":"RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation","description":"RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, get_shared_secret() in crates/ecstore/src/rpc/http_auth.rs, falls back to the public, source-tree-embedded DEFAULT_SECRET_KEY = \"rustfsadmin\" when neither the RUSTFS_RPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2.","publishedAt":"2026-05-28T18:39:54.794Z","updatedAt":"2026-05-30T02:11:41.994Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["rustfs rustfs"],"affected":[{"vendor":"rustfs","product":"rustfs","versions":[{"version":"< 1.0.0-beta.2","status":"affected"}]}],"references":["https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q"],"weaknesses":["CWE-798","CWE-1392"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45039.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45039","state":"PUBLISHED","datePublished":"2026-05-28T18:39:54.794Z","dateUpdated":"2026-05-30T02:11:41.994Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-08T18:07:27.341Z"},"containers":{"cna":{"title":"RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation","descriptions":[{"lang":"en","value":"RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, get_shared_secret() in crates/ecstore/src/rpc/http_auth.rs, falls back to the public, source-tree-embedded DEFAULT_SECRET_KEY = \"rustfsadmin\" when neither the RUSTFS_RPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2."}],"affected":[{"vendor":"rustfs","product":"rustfs","versions":[{"version":"< 1.0.0-beta.2","status":"affected"}]}],"references":[{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q","name":"https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-798","lang":"en","description":"CWE-798: Use of Hard-coded Credentials","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1392","lang":"en","description":"CWE-1392: Use of Default Credentials","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-28T18:39:54.794Z"},"source":{"advisory":"GHSA-r5qv-rc46-hv8q","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-30T02:11:30.613408Z","id":"CVE-2026-45039","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-30T02:11:41.994Z"}}]}}}