Vulnerability in Kvcache-Ai Mooncake
CVE-2026-103764
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.
Published .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/kvcache-ai/Mooncake/issues/4441 (issue-tracking)
- github.com/kvcache-ai/Mooncake/commit/a2933849417259e562fc9cbad63c618d464dfb2d (patch)
- github.com/kvcache-ai/Mooncake/releases/tag/v0.3.13 (release-notes)
- github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db344f145c2914980/mo… (technical-description)
- github.com/kvcache-ai/Mooncake (product)
- www.vulncheck.com/advisories/mooncake-transfer-engine-before-0.3.13-unauthentic… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103764?
- CVE-2026-103764 is a critical-severity vulnerability in Kvcache-Ai Mooncake, classified under Untrusted Pointer Dereference. CVSS score: 9.8/10. Published 2026-10-02.
- How severe is CVE-2026-103764?
- Critical severity. CVSS v3 base score is 9.8 out of 10.