Mooncake before 0.3.12 Out-of-Bounds Read via P2P Handshake readString
Priority HIGH 77CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00464 40th percentileScored 2026-11-07
Fix Fixed Mooncake (kvcache-ai): 0.3.12
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| kvcache-ai | Mooncake | before 0.3.12 | 0.3.12 | Patch available | CNA |
- Mooncake Vendorkvcache-ai Affected before 0.3.12 Fixed in 0.3.12 Patch available CNA
Remediation
- Fix · CNA Mooncake (kvcache-ai) Fixed in 0.3.12
Timeline
- 2026-10-03 Threatist record created from CVE-2026-104433
- 2026-10-03 Alias added: GHSA-ccgr-wx5m-4h7g
- 2026-10-04 Priority changed: MEDIUM → LOW
- 2026-10-05 CISA SSVC decision points changed
- 2026-10-05 Priority changed: LOW → HIGH
References
More kvcache-ai vulnerabilities
- TI-2026-68428 Missing authentication in Mooncake Store REST service CVSS 4.0CRITICAL 9.3
- TI-2026-65760 Mooncake transfer engine before 0.3.13 Unauthenticated Arbitrary Memory Read/Write via TCP Transport CVSS 4.0CRITICAL 9.3
- TI-2026-21201 KTransformers Unsafe Deserialization RCE via balance_serve CVSS 4.0CRITICAL 9.3
- TI-2026-65761 Mooncake through 0.3.13.post1 Missing Authentication in HTTP Metadata Server CVSS 4.0HIGH 8.8
- TI-2026-68429 Mooncake Store lets unauthenticated attackers delete any object CVSS 4.0HIGH 8.8
- TI-2026-65759 Mooncake transfer engine through 0.3.13.post1 Memory Exhaustion via Unbounded Notify Queue CVSS 4.0HIGH 8.7
Sources
- CVE-2026-104433 · CVE Program
- CVE-2026-104433 · NVD
- FIRST EPSS
- GHSA-ccgr-wx5m-4h7g · GitHub Advisory Database · CC BY 4.0
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