# CVE-2026-103761: Mooncake transfer engine through 0.3.13.post1 Memory Exhaustion via Unbounded Notify Queue

> Unauthenticated attackers can exhaust memory by sending unlimited notify frames, causing the Mooncake transfer engine to crash via the out-of-memory killer.

- **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:** 1 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-62mv-x7jm-w9f4

## What is CVE-2026-103761?

CVE-2026-103761 is a high-severity denial of service vulnerability in kvcache-ai Mooncake, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mooncake transfer engine through 0.3.13.post1 contains a memory exhaustion vulnerability in TransferMetadata::receivePeerNotify that allows unauthenticated attackers to grow process memory without limit. Attackers can repeatedly send notify frames up to 1 MB to the handshake RPC port, filling the uncapped notifys vector until the out-of-memory killer terminates the engine.

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

## Which versions are affected by CVE-2026-103761?


## How do I fix CVE-2026-103761?

No fix has been published for CVE-2026-103761 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-103761 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103761 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103761 and fix it if it is affected.

What it is: CVE-2026-103761 is a high-severity denial of service vulnerability in kvcache-ai Mooncake, published on 1 Oct 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-2026-103761 exists.

Affected product: kvcache-ai Mooncake. 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-2026-103761/ (Markdown: https://insights.sbomify.com/CVE-2026-103761/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103761
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103761
- OSV: https://osv.dev/vulnerability/CVE-2026-103761

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103761/
Summaries are generated and may contain mistakes; the official description above is the record.