CVE-2026-103764

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-02. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Mooncake transfer engine before 0.3.13 contains an untrusted pointer dereference in ServerSession::readHeader that allows unauthenticated attackers to read and write arbitrary process memory via the TCP transport data port. Attackers can send a crafted SessionHeader with arbitrary addr and size values using READ or WRITE opcodes to disclose KV cache contents, prompts and secrets or corrupt memory toward code execution.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
75
EG Risk 75/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 1, 2026

Last Modified

October 2, 2026

Advisory Details (5)

Auto-updated Oct 2, 2026
Patch available. Sources: github_release.
generic

[Bug]: Unauthenticated arbitrary memory read and write in Mooncake TCP transport data plane · Issue #4441 · kvcache-ai/Mooncake · GitHub

https://github.com/kvcache-ai/Mooncake/issues/4441
generic

Mooncake transfer engine before 0.3.13 Unauthenticated Arbitrary Memory Read/Write via TCP Transport | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mooncake-transfer-engine-before-0.3.13-unauthenticated-arbitrary-memory-read-write-via-tcp-transport
github_release Patch Available

v0.3.13

Patch available: kvcache-ai/Mooncake v0.3.13

https://github.com/kvcache-ai/Mooncake/releases/tag/v0.3.13
generic

Mooncake/mooncake-transfer-engine/src/transport/tcp_transport/tcp_transport.cpp at 6041a609a8c3af35e778f70db344f145c2914980 · kvcache-ai/Mooncake · GitHub

https://github.com/kvcache-ai/Mooncake/blob/6041a609a8c3af35e778f70db344f145c2914980/mooncake-transfer-engine/src/transport/tcp_transport/tcp_transport.cpp#L209
generic

GitHub - kvcache-ai/Mooncake: Mooncake is the serving platform for Kimi, a leading LLM service provided by Moonshot AI. · GitHub

https://github.com/kvcache-ai/Mooncake

Vendor Advisories for CVE-2026-103764(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 10:57 UTCGHSA enrichment
  2. 2026-10-05 07:13 UTCGHSA enrichment
  3. 2026-10-05 03:29 UTCGHSA enrichment
  4. 2026-10-04 23:45 UTCEG score recompute
  5. 2026-10-04 23:44 UTCGHSA enrichment
  6. 2026-10-04 23:21 UTCEPSS rescore
  7. 2026-10-04 20:01 UTCGHSA enrichment
  8. 2026-10-04 16:16 UTCGHSA enrichment
  9. 2026-10-04 12:32 UTCGHSA enrichment
  10. 2026-10-04 08:48 UTCGHSA enrichment
  11. 2026-10-04 05:04 UTCGHSA enrichment
  12. 2026-10-04 01:20 UTCGHSA enrichment
  13. 2026-10-03 21:34 UTCGHSA enrichment
  14. 2026-10-03 17:49 UTCEG score recompute
  15. 2026-10-03 17:49 UTCGHSA enrichment
  16. 2026-10-03 14:25 UTCEPSS rescore
  17. 2026-10-03 14:06 UTCGHSA enrichment
  18. 2026-10-03 10:22 UTCGHSA enrichment
  19. 2026-10-03 06:38 UTCGHSA enrichment
  20. 2026-10-03 02:54 UTCGHSA enrichment
  21. 2026-10-02 23:06 UTCGHSA enrichment
  22. 2026-10-02 19:20 UTCEG score recompute
  23. 2026-10-02 19:20 UTCGHSA enrichment
  24. 2026-10-02 18:37 UTCEG score recompute
  25. 2026-10-02 18:37 UTCGHSA enrichment
Show 12 more
  1. 2026-10-02 18:16 UTCGHSA enrichment
  2. 2026-10-02 18:15 UTCGHSA enrichment
  3. 2026-10-02 18:15 UTCEG score recompute
  4. 2026-10-02 18:15 UTCGHSA enrichment
  5. 2026-10-02 15:29 UTCGHSA enrichment
  6. 2026-10-02 11:44 UTCGHSA enrichment
  7. 2026-10-02 07:57 UTCGHSA enrichment
  8. 2026-10-02 04:13 UTCEG score recompute
  9. 2026-10-02 04:12 UTCGHSA enrichment
  10. 2026-10-02 00:25 UTCEG score recompute
  11. 2026-10-01 23:23 UTCEG score recompute
  12. 2026-10-01 23:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103764?
CVE-2026-103764 is a critical vulnerability published on October 1, 2026. Mooncake transfer engine before 0.3.13 contains an untrusted pointer dereference in ServerSession::readHeader that allows unauthenticated attackers to read and write arbitrary process memory via the TCP transport data port. Attackers can send a crafted SessionHeader with arbitrary addr and size…
When was CVE-2026-103764 disclosed?
CVE-2026-103764 was first published on October 1, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103764 actively exploited?
CVE-2026-103764 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103764?
CVE-2026-103764 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103764?
A fix for CVE-2026-103764 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103764 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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