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

> RustFS incorrectly evaluates negated IAM policy conditions, allowing attackers to bypass access controls and gain unauthorized access to stored data.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-v9cp-qfw9-9pfp

## What is CVE-2026-73289?

CVE-2026-73289 is a high-severity authentication bypass vulnerability in rustfs, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-73289?


## How do I fix CVE-2026-73289?

No fix has been published for CVE-2026-73289 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73289 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73289 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73289 and fix it if it is affected.

What it is: CVE-2026-73289 is a high-severity authentication bypass vulnerability in rustfs, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73289 exists.

Affected product: rustfs. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-73289/ (Markdown: https://insights.sbomify.com/CVE-2026-73289/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73289
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73289
- OSV: https://osv.dev/vulnerability/CVE-2026-73289

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73289/
Summaries are generated and may contain mistakes; the official description above is the record.