{"id":"CVE-2026-73285","state":"PUBLISHED","title":"RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged","description":"RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.","publishedAt":"2026-08-12T14:37:42.271Z","updatedAt":"2026-08-12T15:11:01.651Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/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-alpha.64, < 1.0.0-rc.1","status":"affected"}]}],"references":["https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d","https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47","https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73285.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73285","state":"PUBLISHED","datePublished":"2026-08-12T14:37:42.271Z","dateUpdated":"2026-08-12T15:11:01.651Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-11T19:42:11.450Z"},"containers":{"cna":{"title":"RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged","descriptions":[{"lang":"en","value":"RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1."}],"affected":[{"vendor":"rustfs","product":"rustfs","versions":[{"version":">= 1.0.0-alpha.64, < 1.0.0-rc.1","status":"affected"}]}],"references":[{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","name":"https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d","name":"https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d","tags":["x_refsource_MISC"]},{"url":"https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47","name":"https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47","tags":["x_refsource_MISC"]},{"url":"https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1","name":"https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-12T14:37:42.271Z"},"source":{"advisory":"GHSA-5w8r-p896-6vq2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-12T15:07:58.760961Z","id":"CVE-2026-73285","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-12T15:11:01.651Z"}}]}}}