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Missing authorization in Mooncake Store allows replica injection

Priority HIGH 70CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Mooncake Store from 0 through 0.3.13.post1 by kvcache-ai contains a missing authorization flaw (CWE-862). An unauthenticated remote attacker can inject completed LOCAL_DISK replicas through the NotifyOffloadSuccess RPC. The attacker mounts a local disk segment under a self-chosen client UUID and attaches replicas that point to attacker-controlled endpoints, which lets them serve poisoned disk-tier reads and fake key existence.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Mooncake Store master through 0.3.13.post1 contains a missing authorization vulnerability that allows unauthenticated attackers to inject completed LOCAL_DISK replicas through the NotifyOffloadSuccess RPC. Attackers can mount a local disk segment with a self-chosen client UUID, then attach replicas pointing at attacker-controlled endpoints to serve poisoned disk-tier reads and fake key existence.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00332 26th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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

VendorProductAffected versionsFixed inStatusSource
kvcache-aiMooncakeup to 0.3.13.post1—No fix listedCNA
  • Mooncake Vendorkvcache-ai Affected up to 0.3.13.post1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Mooncake.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-106041
  2. 2026-10-06 Alias added: GHSA-whqj-m6f3-5p4j
  3. 2026-10-06 CISA SSVC decision points changed
  4. 2026-10-06 Priority changed: MEDIUM → HIGH

References

  • 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-2026-67384 Mooncake before 0.3.12 Out-of-Bounds Read via P2P Handshake readString CVSS 4.0HIGH 8.7
See all 14 →

Sources