Out-of-bounds Read in Kvcache-Ai Mooncake
CVE-2026-104433
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/4452 (issue-tracking)
- github.com/kvcache-ai/Mooncake/commit/c142b40590259360196d8e504b2193382529e7b4 (patch)
- github.com/kvcache-ai/Mooncake (product)
- www.vulncheck.com/advisories/mooncake-before-0.3.12-out-of-bounds-read-via-p2p-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104433?
- CVE-2026-104433 is a high-severity vulnerability in Kvcache-Ai Mooncake, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-10-03.
- How severe is CVE-2026-104433?
- High severity. CVSS v3 base score is 7.5 out of 10.