What’s Vulnerable › Vulnerabilities

CVE-2026-103764: Mooncake transfer engine before 0.3.13 Unauthenticated Arbitrary Memory Read/Write via TCP Transport

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-02
• Weakness: CWE-822

Description

Mooncake transfer engine before 0.3.13 contains an untrusted pointer dereference in ServerSession::readHeader that allows unauthenticated attackers to read and write arbitrary process memory via the TCP transport data port. Attackers can send a crafted SessionHeader with arbitrary addr and size values using READ or WRITE opcodes to disclose KV cache contents, prompts and secrets or corrupt memory toward code execution.

Affected products

• kvcache-ai Mooncake: before 0.3.13 — fixed in 0.3.13

How to fix

Upgrade to a fixed version: kvcache-ai Mooncake 0.3.13. Check the vendor advisory for mitigations.

References

• https://github.com/kvcache-ai/Mooncake
• https://github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db344f145c2914980/mooncake-transfer-engine/src/transport/tcp_transport/tcp_transport.cpp#L209
• https://github.com/kvcache-ai/Mooncake/commit/a2933849417259e562fc9cbad63c618d464dfb2d
• https://github.com/kvcache-ai/Mooncake/issues/4441
• https://github.com/kvcache-ai/Mooncake/releases/tag/v0.3.13
• https://www.vulncheck.com/advisories/mooncake-transfer-engine-before-0.3.13-unauthenticated-arbitrary-memory-read-write-via-tcp-transport
• https://github.com/kvcache-ai/Mooncake/issues/4441

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