What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-02
• Weakness: CWE-306

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

• kvcache-ai Mooncake: through 0.3.13.post1

References

• https://github.com/kvcache-ai/Mooncake
• https://github.com/kvcache-ai/Mooncake/blob/719735896c86b56fabec6cf3e825fb2ea640597a/mooncake-wheel/mooncake/http_metadata_server.py#L61-L106
• https://github.com/kvcache-ai/Mooncake/issues/4444
• https://www.vulncheck.com/advisories/mooncake-through-0.3.13-post1-missing-authentication-in-http-metadata-server
• https://github.com/kvcache-ai/Mooncake/issues/4444

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