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.
References7
- github.com/kvcache-ai/Mooncake
- github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db34…
- github.com/kvcache-ai/Mooncake/commit/a2933849417259e562fc9cbad…
- github.com/kvcache-ai/Mooncake/issues/4441
- github.com/kvcache-ai/Mooncake/releases/tag/v0.3.13
- www.vulncheck.com/advisories/mooncake-transfer-engine-before-0.…
- github.com/kvcache-ai/Mooncake/issues/4441
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 57 · as of 10 November 2026
- CWE
- CWE-822
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.