# CVE-2026-94002: Apache MINA SSHD: Memory exhaustion in SFTP client via unsolicited SFTP replies

> A malicious SSH server can exhaust client memory by sending unsolicited SFTP replies, causing a denial of service in applications using Apache MINA SSHD.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 30 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-94002, GHSA-mf93-r5x4-wxqr, UBUNTU-CVE-2026-94002

## What is CVE-2026-94002?

CVE-2026-94002 is a high-severity denial of service vulnerability in Apache MINA SSHD, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Possible memory exhaustion in SFTP clients (DefaultSftpClient) in component sshd-sftp in Apache MINA SSHD versions 0.9.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5.

Apache 
MINA SSHD is a Java library for client-side and server-side SSH. The sshd-sftp component provides support for SFTP.

The SFTP client implementation, when receiving a reply, did not check that this reply corresponded to a request sent earlier. Unsolicited replies would be stored but never consumed. A malicious server could keep sending unsolicited replies until available memory in the client was exhausted.

Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-94002?


## How do I fix CVE-2026-94002?

Upgrade to a fixed version.

## Is CVE-2026-94002 being exploited?

There is no known exploitation of CVE-2026-94002 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-94002 and fix it if it is affected.

What it is: CVE-2026-94002 is a high-severity denial of service vulnerability in Apache MINA SSHD, published on 30 Sep 2026. 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-2026-94002 in the wild and no public exploit code.

Affected product: Apache MINA SSHD. 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-2026-94002/ (Markdown: https://insights.sbomify.com/CVE-2026-94002/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-94002
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-94002
- OSV: https://osv.dev/vulnerability/CVE-2026-94002

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-94002/
Summaries are generated and may contain mistakes; the official description above is the record.