Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck

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

High 7.5

In plain English

A high-severity out-of-bounds read 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 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 59.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
kvcache-ai	Mooncake	0 – before 0.3.12

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

GitHub Issue #4452 issue-tracking
https://github.com/kvcache-ai/Mooncake/commit/c142b40590259360196d8e504b2193382529e7b4 patch
https://github.com/kvcache-ai/Mooncake product
VulnCheck Advisory: Mooncake before 0.3.12 Out-of-Bounds Read via P2P Handshake readString third-party-advisory