{"id":"CVE-2026-73285","title":"RustFS is a distributed object storage system built in Rust","summary":"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_…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-863"],"published":"2026-08-12","updated":"2026-09-09","sourceUpdated":"2026-09-09T20:55:04.493","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73285","references":[{"url":"https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47","label":"security-advisories@github.com"},{"url":"https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d","label":"security-advisories@github.com"},{"url":"https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1","label":"security-advisories@github.com"},{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","label":"security-advisories@github.com"},{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00346,"epssPercentile":0.28208,"ingestedAt":"2026-09-09T21:22:45.531Z","slug":"CVE-2026-73285","body":"## Overview\n\nRustFS 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}