What’s Vulnerable › Vulnerabilities

CVE-2026-104433: Mooncake before 0.3.12 Out-of-Bounds Read via P2P Handshake readString

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-03 · updated 2026-10-06
• Weakness: CWE-125

Description

Mooncake transfer engine before 0.3.12 contains an out-of-bounds read vulnerability in the readString function of include/common.h that allows unauthenticated attackers to crash the service by sending a zero-length handshake frame. Attackers can connect to the handshake port listening on all interfaces and send an eight-byte frame to terminate the hosting process, such as an SGLang inference server.

Affected products

• kvcache-ai Mooncake: before 0.3.12 — fixed in 0.3.12

How to fix

Upgrade to a fixed version: kvcache-ai Mooncake 0.3.12. Check the vendor advisory for mitigations.

References

• https://github.com/kvcache-ai/Mooncake
• https://github.com/kvcache-ai/Mooncake/commit/c142b40590259360196d8e504b2193382529e7b4
• https://github.com/kvcache-ai/Mooncake/issues/4452
• https://www.vulncheck.com/advisories/mooncake-before-0.3.12-out-of-bounds-read-via-p2p-handshake-readstring
• https://github.com/kvcache-ai/Mooncake/issues/4452

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