# CVE-2026-103764: Mooncake transfer engine untrusted pointer dereference

Source: https://junglewise.ai/threats/cve-2026-103764-mooncake-transfer-engine-before-0-3-13-contains-an-untrusted  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-02. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-103764 · Severity: critical · CVSS 9.8 · Published 2026-10-02

Mooncake is the serving platform for Kimi, a large language model service. An unauthenticated attacker can send crafted network requests to read and write arbitrary memory in the transfer engine process, allowing them to steal sensitive model data, prompts, and secrets, or achieve code execution.

Vendors: [Kvcache-Ai](https://junglewise.ai/threats/vendors/kvcache-ai).

## Quick answers

**Is CVE-2026-103764 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103764 being exploited in the wild.

**How severe is CVE-2026-103764?** Critical severity, with a CVSS score of 9.8, published 2 October 2026.

**Which products and versions are affected?** Kvcache-Ai Mooncake transfer engine before 0.3.13.

**Is there a fix for CVE-2026-103764?** Yes: fixed in Mooncake transfer engine 0.3.13. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103764 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-103764?** Check whether you run Kvcache-Ai Mooncake transfer engine at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Mooncake transfer engine 0.3.13

## Technical details

An untrusted pointer dereference vulnerability exists in ServerSession::readHeader within the TCP transport layer (mooncake-transfer-engine). Attackers can send crafted SessionHeader messages with arbitrary addr and size values using READ or WRITE opcodes over the TCP data port without authentication to disclose KV cache contents and secrets or corrupt memory toward remote code execution.

## Affected products

- KVCache AI Mooncake transfer engine before 0.3.13

## Timeline

- 2026-10-02: disclosed

## References

- [https://github.com/kvcache-ai/Mooncake](https://github.com/kvcache-ai/Mooncake)
- [https://github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db344f145c2914980/mooncake-transfer-engine/src/transport/tcp_transport/tcp_transport.cpp](https://github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db344f145c2914980/mooncake-transfer-engine/src/transport/tcp_transport/tcp_transport.cpp)

## Related threats

- [Mooncake transfer engine denial of service in handshake RPC](https://junglewise.ai/threats/cve-2026-103760-mooncake-transfer-engine-through-0-3-13-post1-contains-a-denial)