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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductMooncake

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-822CWE-822

How to fix

Update

kvcache-ai Mooncake0.3.13 or later

Patches

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

Vendor advisories

github.com/kvcache-ai/Mooncake/releases/tag/v0.3.13

Affected products

Product	Affected versions	Fixed in
kvcache-ai Mooncake	v < 0.3.13	0.3.13

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