CVE-2026-103764

critical

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.

References

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/releases/tag/v0.3.13

https://github.com/kvcache-ai/Mooncake/issues/4441

https://github.com/kvcache-ai/Mooncake/commit/a2933849417259e562fc9cbad63c618d464dfb2d

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-91136

Details

Source: Mitre, NVD

Published: 2026-10-02

Updated: 2026-10-02

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: Critical

EPSS

EPSS: 0.00636