# CVE-2026-95845: Moquette unbounded per-session message queues allow memory exhaustion

> Remote attackers can exhaust broker resources by sending messages to slow subscribers, causing denial of service in Moquette MQTT broker.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Sep 2026
- **Updated:** 23 Sep 2026

## What is CVE-2026-95845?

CVE-2026-95845 is a high-severity denial of service vulnerability in moquette-io moquette, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. When a fast publisher sends messages to a slow subscriber whose in-flight window is full, queued messages can accumulate without bound in memory or persistent storage. Remote clients can use this condition to exhaust broker resources and cause a denial of service. This issue is fixed in version 0.18.1.

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

## Which versions are affected by CVE-2026-95845?

It affects 1 product.


Products: Moquette Moquette.

## How do I fix CVE-2026-95845?

No fix has been published for CVE-2026-95845 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-95845 being exploited?

There is no known exploitation of CVE-2026-95845 in the wild and no public exploit code.

## Other vulnerabilities in moquette-io moquette

- [CVE-2026-85724](https://insights.sbomify.com/CVE-2026-85724/): Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass (critical 9.6)
- [CVE-2026-95848](https://insights.sbomify.com/CVE-2026-95848/): Moquette fails open when configured authentication or authorization classes cannot load (critical 9.3)
- [CVE-2026-95847](https://insights.sbomify.com/CVE-2026-95847/): Moquette client IDs can cause cross-session H2 durable-queue corruption (high 8.8)
- [CVE-2026-95842](https://insights.sbomify.com/CVE-2026-95842/): Moquette uncaught MQTT command exceptions can terminate shared session event loops (high 8.7)
- [CVE-2026-95843](https://insights.sbomify.com/CVE-2026-95843/): Moquette malformed shared subscriptions can crash command processing (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-95845 and fix it if it is affected.

What it is: CVE-2026-95845 is a high-severity denial of service vulnerability in moquette-io moquette, published on 23 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-2026-95845 in the wild and no public exploit code.

Affected product: moquette-io moquette. 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-2026-95845/ (Markdown: https://insights.sbomify.com/CVE-2026-95845/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-95845
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-95845
- OSV: https://osv.dev/vulnerability/CVE-2026-95845

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-95845/
Summaries are generated and may contain mistakes; the official description above is the record.