# CVE-2026-85455: MOOS core-moos through 10.4.0 MOOSDB Out-of-Bounds Read via Short Packet

> Attackers can read out-of-bounds memory or cause crashes by sending crafted short packets to the MOOSDB server before authentication.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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:** 3 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-2wvf-qgpv-j3rg

## What is CVE-2026-85455?

CVE-2026-85455 is a high-severity memory corruption vulnerability in themoos core-moos, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MOOS core-moos through 10.4.0 contains a buffer over-read vulnerability in CMOOSCommPkt where a four-byte packet triggers out-of-bounds memory access during deserialization. Attackers can open a TCP connection to the MOOSDB port and send a crafted short packet to read memory before authentication.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-85455?

It affects 1 product.


Products: Themoos Core-Moos.

## How do I fix CVE-2026-85455?

No fix has been published for CVE-2026-85455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85455 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85455 exists.

## Other vulnerabilities in themoos core-moos

- [CVE-2026-85424](https://insights.sbomify.com/CVE-2026-85424/): MOOS core-moos through 10.4.0 Missing Authentication for MOOSDB Publish, Subscribe and DB_CLEAR (critical 9.3)
- [CVE-2026-85428](https://insights.sbomify.com/CVE-2026-85428/): MOOS core-moos through 10.4.0 MOOSDB HTTP Server Unauthenticated Variable Write (critical 9.3)
- [CVE-2026-85440](https://insights.sbomify.com/CVE-2026-85440/): MOOS core-moos through 10.4.0 MOOSDB Pre-Authentication Heap Overflow via Negative Packet Length (critical 9.3)
- [CVE-2026-85432](https://insights.sbomify.com/CVE-2026-85432/): MOOS core-moos through 10.4.0 MOOSDB Message Source Spoofing via Wire Identity (high 8.8)
- [CVE-2026-85441](https://insights.sbomify.com/CVE-2026-85441/): MOOS core-moos through 10.4.0 MOOSDB Denial of Service via Negative Serialized String Length (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85455 and fix it if it is affected.

What it is: CVE-2026-85455 is a high-severity memory corruption vulnerability in themoos core-moos, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85455 exists.

Affected product: themoos core-moos. 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-2026-85455/ (Markdown: https://insights.sbomify.com/CVE-2026-85455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85455
- OSV: https://osv.dev/vulnerability/CVE-2026-85455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85455/
Summaries are generated and may contain mistakes; the official description above is the record.