What’s Vulnerable › Vulnerabilities

CVE-2026-73289: RustFS: ForAllValues/ForAnyValue negated string conditions are transposed, inverting IAM and bucket-policy decisions

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-09-09
• Weakness: CWE-863

Description

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 eval_like 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 products

• rustfs: before 1.0.0-beta.12

References

• https://github.com/rustfs/rustfs/commit/92f83bfe155d8a3b9cdd903086e5b28d52339efb
• https://github.com/rustfs/rustfs/releases/tag/1.0.0-beta.12
• https://github.com/rustfs/rustfs/security/advisories/GHSA-v9cp-qfw9-9pfp

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