CVE-2026-73289: RustFS: ForAllValues/ForAnyValue negated string conditions are transposed, inverting IAM and bucket-policy decisions
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.12, RustFS evaluates the ForAllValues: and ForAnyValue: set qualifiers with the negated string operators StringNotEquals, StringNotEqualsIgnoreCase, StringNotLike, ArnNotEquals, and ArnNotLike using each other's semantics because crates/policy/src/policy/function/string.rs negates the aggregate result after eval or evallike instead of negating each request-value predicate before quantification. Partially overlapping policy and request value sets can therefore make an Allow condition grant access to an excluded principal or make a Deny guardrail fail, including policies based on jwt:groups and jwt:roles; absent keys also receive the opposite ForAllValues: and ForAnyValue: behavior. This issue is fixed in version 1.0.0-beta.12.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 1.0.0-beta.12
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73289?
CVE-2026-73289 has a severity rating of high, with a score of 8.1.
How do I fix CVE-2026-73289?
To fix CVE-2026-73289, update RustFS to version 1.0.0-beta.12 or later.
What specific conditions are affected by CVE-2026-73289?
CVE-2026-73289 affects the evaluation of the ForAllValues and ForAnyValue qualifiers with certain negated string operators.
What impact does CVE-2026-73289 have on IAM and bucket-policy decisions?
CVE-2026-73289 inverts IAM and bucket-policy decisions due to transposed negation conditions.
When was CVE-2026-73289 published?
CVE-2026-73289 was published on August 12, 2026.