# CVE-2018-1000538: Denial of service in n/a

> Attackers can cause denial of service in Minio S3 server by sending large signed request bodies, exhausting memory resources.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Jun 2018
- **Updated:** 5 Aug 2024
- **Also known as:** MINI-h9fj-pm3v-whpp, MINI-vc98-jcw3-4wgp

## What is CVE-2018-1000538?

CVE-2018-1000538 is a high-severity denial of service vulnerability in n/a, published on 26 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Minio Inc. Minio S3 server version prior to RELEASE.2018-05-16T23-35-33Z contains a Allocation of Memory Without Limits or Throttling (similar to CWE-774) vulnerability in write-to-RAM that can result in Denial of Service. This attack appear to be exploitable via Sending V4-(pre)signed requests with large bodies . This vulnerability appears to have been fixed in after commit 9c8b7306f55f2c8c0a5c7cea9a8db9d34be8faa7.

Weakness: CWE-774 (Allocation of File Descriptors or Handles Without Limits or Throttling)

## Which versions are affected by CVE-2018-1000538?

It affects 1 product.


Products: Minio Minio.

## How do I fix CVE-2018-1000538?

Upgrade to a fixed version.

## Is CVE-2018-1000538 being exploited?

There is no known exploitation of CVE-2018-1000538 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-28434](https://insights.sbomify.com/CVE-2023-28434/): MinIO Security Feature Bypass (high 8.8, exploited in the wild)
- [CVE-2023-28432](https://insights.sbomify.com/CVE-2023-28432/): MinIO Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2020-11012](https://insights.sbomify.com/CVE-2020-11012/): Authentication bypass MinIO Admin API (critical 9.3)
- [CVE-2026-33322](https://insights.sbomify.com/CVE-2026-33322/): MinIO: JWT Algorithm Confusion in OIDC Authentication (critical 9.2)
- [CVE-2026-33419](https://insights.sbomify.com/CVE-2026-33419/): MinIO: LDAP login brute-force via user enumeration and missing rate limit (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1000538 and fix it if it is affected.

What it is: CVE-2018-1000538 is a high-severity denial of service vulnerability in n/a, published on 26 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1000538 in the wild and no public exploit code.

Affected product: n/a. 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-2018-1000538/ (Markdown: https://insights.sbomify.com/CVE-2018-1000538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000538
- OSV: https://osv.dev/vulnerability/CVE-2018-1000538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000538/
Summaries are generated and may contain mistakes; the official description above is the record.