# CVE-2026-3821: Supermicro SMASH service contain an Arbitrary code execution issue

> An authorized attacker can exploit SMASH input to execute arbitrary code or cause denial of service on Supermicro BMCs.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 22 Jul 2026
- **Updated:** 22 Jul 2026
- **Also known as:** GHSA-cjff-5v28-x7h8

## What is CVE-2026-3821?

CVE-2026-3821 is a high-severity command injection vulnerability in SMCI X14DBG-DAP,X14DBI, published on 22 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Supermicro (SMC) SMASH services contain an Arbitrary code execution issue in X14DBG-DAP and X14DBI.
An authorized attacker can exploit SMASH’s input capability to compromise data integrity or launch a Denial-of-Service (DoS) attack against the BMC.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-3821?


## How do I fix CVE-2026-3821?

No fix has been published for CVE-2026-3821 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3821 being exploited?

There is no known exploitation of CVE-2026-3821 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3821 and fix it if it is affected.

What it is: CVE-2026-3821 is a high-severity command injection vulnerability in SMCI X14DBG-DAP,X14DBI, published on 22 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3821 in the wild and no public exploit code.

Affected product: SMCI X14DBG-DAP,X14DBI. 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-2026-3821/ (Markdown: https://insights.sbomify.com/CVE-2026-3821/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3821
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3821
- OSV: https://osv.dev/vulnerability/CVE-2026-3821

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-3821/
Summaries are generated and may contain mistakes; the official description above is the record.