Vulnerability · Published Oct 1, 2026 · Assigned by VulnCheck

CVE-2026-103765Mooncake through 0.3.13.post1 Missing Authentication in HTTP Metadata Server

Critical 9.4

In plain English

A critical-severity missing authentication in Mooncake from kvcache-ai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.4Critical

Exploit odds (30 days)0.6%top 49.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
kvcache-ai	Mooncake	0 – through 0.3.13.post1

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

References

GitHub Issue #4444 issue-tracking
https://github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mooncake-wheel/mooncake/http_metadata_server.py#L61-L106 technical-description
https://github.com/kvcache-ai/Mooncake product
VulnCheck Advisory: Mooncake through 0.3.13.post1 Missing Authentication in HTTP Metadata Server third-party-advisory