CVE-2026-96763

Description

A security flaw has been discovered in kvcache-ai mooncake up to 0.3.12/0.3.13.post1/0.3.14-rc1. This issue affects the function ScopedSegmentAccess::MountSegment of the file segment.cpp of the component MountSegment Request Processing. Performing a manipulation results in improper access controls. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Overview

State: PUBLISHED
Assigner (CNA): VulDB
CVSS severity: MEDIUM
CVSS score: 5.3 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Effective score: 5.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-284, CWE-266
Reserved: 2026-09-23
Published: 2026-09-24 00:00 UTC
Last updated: 2026-09-24 00:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/96xxx/CVE-2026-96763.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-24 01:16:59 UTC
NVD last modified: 2026-09-24 01:16:59 UTC
NVD CVSS v3.1: 5.4 / 10 MEDIUM source: cna@vuldb.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Exploitability subscore: 2.8 / 10
Impact subscore: 2.5 / 10

Affected products (1)

Vendor	Product	Versions	Platforms
kvcache-ai	mooncake	`0.3.0` (affected), `0.3.1` (affected), `0.3.2` (affected), `0.3.3` (affected), `0.3.4` (affected), `0.3.5` (affected), `0.3.6` (affected), `0.3.7` (affected), `0.3.8` (affected), `0.3.9` (affected), `0.3.10` (affected), `0.3.11` (affected), `0.3.12` (affected), `0.3.13.post1` (affected), `0.3.14-rc1` (affected)	—

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

VDB-409018 | kvcache-ai mooncake MountSegment Request Processing segment.cpp access control vdb-entrytechnical-description
VDB-409018 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
CVE-2026-96763 | CVE Analysis and Report third-party-advisory
Submit #904605 | kvcache-ai mooncake mooncake-transfer-engine==0.3.11.post1 Access Control third-party-advisory
https://gist.github.com/yyymk/fea24846dc31042cb472d7bd496a8438 exploit

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://gist.github.com/yyymk/fea24846dc31042cb472d7bd496a8438 cna@vuldb.com
https://vuldb.com/cve/CVE-2026-96763 cna@vuldb.com
https://vuldb.com/submit/904605 cna@vuldb.com
https://vuldb.com/vuln/409018 cna@vuldb.com
https://vuldb.com/vuln/409018/cti cna@vuldb.com

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-96763.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:kvcache-ai:mooncake:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "MountSegment Request Processing"
          ],
          "product": "mooncake",
          "vendor": "kvcache-ai",
          "versions": [
            {
              "status": "affected",
              "version": "0.3.0"
            },
            {
              "status": "affected",
              "version": "0.3.1"
            },
            {
              "status": "affected",
              "version": "0.3.2"
            },
            {
              "status": "affected",
              "version": "0.3.3"
            },
            {
              "status": "affected",
              "version": "0.3.4"
            },
            {
              "status": "affected",
              "version": "0.3.5"
            },
            {
              "status": "affected",
              "version": "0.3.6"
            },
            {
              "status": "affected",
              "version": "0.3.7"
            },
            {
              "status": "affected",
              "version": "0.3.8"
            },
            {
              "status": "affected",
              "version": "0.3.9"
            },
            {
              "status": "affected",
              "version": "0.3.10"
            },
            {
              "status": "affected",
              "version": "0.3.11"
            },
            {
              "status": "affected",
              "version": "0.3.12"
            },
            {
              "status": "affected",
              "version": "0.3.13.post1"
            },
            {
              "status": "affected",
              "version": "0.3.14-rc1"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "YYYMK (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A security flaw has been discovered in kvcache-ai mooncake up to 0.3.12/0.3.13.post1/0.3.14-rc1. This issue affects the function ScopedSegmentAccess::MountSegment of the file segment.cpp of the component MountSegment Request Processing. Performing a manipulation results in improper access controls. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 6.4,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P/E:POC/RL:ND/RC:UR",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "Improper Access Controls",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-266",
              "description": "Incorrect Privilege Assignment",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T00:00:16.519Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-409018 | kvcache-ai mooncake MountSegment Request Processing segment.cpp access control",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/409018"
        },
        {
          "name": "VDB-409018 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/409018/cti"
        },
        {
          "name": "CVE-2026-96763 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-96763"
        },
        {
          "name": "Submit #904605 | kvcache-ai mooncake mooncake-transfer-engine==0.3.11.post1 Access Control",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/904605"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://gist.github.com/yyymk/fea24846dc31042cb472d7bd496a8438"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-23T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-09-23T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-09-23T18:06:34.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "kvcache-ai mooncake MountSegment Request Processing segment.cpp access control",
      "x_generator": [
        "VulDB PVTS v202609"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-96763",
    "datePublished": "2026-09-24T00:00:16.519Z",
    "dateReserved": "2026-09-23T16:01:21.340Z",
    "dateUpdated": "2026-09-24T00:00:16.519Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}