Auth bypass in Kvcache-Ai Mooncake
CVE-2026-103765
Mooncake through 0.3.13.post1 contains a missing authentication vulnerability in the HTTP metadata server /metadata handler that allows unauthenticated attackers to read, overwrite, and delete transfer engine metadata keys. Attackers can poison segment descriptors such as tcp_data_port or re-create rpc_meta entries to redirect KV cache transfers to attacker-controlled listeners, or exhaust server memory.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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/4444 (issue-tracking)
- github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mo… (technical-description)
- github.com/kvcache-ai/Mooncake (product)
- www.vulncheck.com/advisories/mooncake-through-0.3.13-post1-missing-authenticati… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103765?
- CVE-2026-103765 is a critical-severity vulnerability in Kvcache-Ai Mooncake, classified under Missing Authentication for Critical Function. CVSS score: 9.4/10. Published 2026-10-02.
- How severe is CVE-2026-103765?
- Critical severity. CVSS v3 base score is 9.4 out of 10.