Vulnerability-Lookup

GHSA-FMQX-854H-CFFF

Vulnerability from github – Published: 2026-10-09 06:31 – Updated: 2026-10-09 06:31

Details

A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a remote attacker who can issue Redis replication commands (for example, against an instance with no password configured) to cause a denial of service or disclose heap memory by supplying a crafted RDB stream whose sub-buffer length field exceeds the remaining buffer size. The only bounds check is an ASSERT(), which is compiled out in release builds, so memcpy() reads past the end of the heap allocation.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

8.8 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-7826"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-09T05:16:45Z",
    "severity": "HIGH"
  },
  "details": "A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a remote attacker who can issue Redis replication commands (for example, against an instance with no password configured) to cause a denial of service or disclose heap memory by supplying a crafted RDB stream whose sub-buffer length field exceeds the remaining buffer size. The only bounds check is an ASSERT(), which is compiled out in release builds, so memcpy() reads past the end of the heap allocation.",
  "id": "GHSA-fmqx-854h-cfff",
  "modified": "2026-10-09T06:31:18Z",
  "published": "2026-10-09T06:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7826"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FalkorDB/FalkorDB/pull/1972"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FalkorDB/FalkorDB/commit/55d986f45ecd5d80f7a9e5e138e8b0f96535b48c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FalkorDB/FalkorDB/releases/tag/v4.18.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-7826 (GCVE-0-2026-7826)

Vulnerability from cvelistv5 – Published: 2026-10-09 04:04 – Updated: 2026-10-09 04:04

Title

Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB

Summary

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Assigner

securin CNA under the mitre root

CNA scorecard B 80/100 over 70 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/FalkorDB/FalkorDB/pull/1972	patch
https://github.com/FalkorDB/FalkorDB/commit/55d98…	patch
https://github.com/FalkorDB/FalkorDB/releases/tag…	release-notes

Impacted products

1 product

Vendor	Product	Version
FalkorDB	FalkorDB	Affected: 0 , < 4.18.4 (semver) cpe:2.3:a:falkordb:falkordb::::::::

Credits

Arjun Basnet from Securin

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/FalkorDB/FalkorDB",
          "cpes": [
            "cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "RDB serializer / graph decoder"
          ],
          "product": "FalkorDB",
          "programFiles": [
            "src/serializers/serializer_io.c"
          ],
          "programRoutines": [
            {
              "name": "BufferSerializerIOv2_ReadBuffer"
            }
          ],
          "repo": "https://github.com/FalkorDB/FalkorDB",
          "vendor": "FalkorDB",
          "versions": [
            {
              "lessThan": "4.18.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Arjun Basnet from Securin"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a remote attacker who can issue Redis replication commands (for example, against an instance with no password configured) to cause a denial of service or disclose heap memory by supplying a crafted RDB stream whose sub-buffer length field exceeds the remaining buffer size. The only bounds check is an ASSERT(), which is compiled out in release builds, so memcpy() reads past the end of the heap allocation."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-540",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-540 Overread Buffers"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-09T04:04:30.130Z",
        "orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
        "shortName": "securin"
      },
      "references": [
        {
          "name": "FalkorDB PR #1972",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/FalkorDB/FalkorDB/pull/1972"
        },
        {
          "name": "Fix commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/FalkorDB/FalkorDB/commit/55d986f45ecd5d80f7a9e5e138e8b0f96535b48c"
        },
        {
          "name": "FalkorDB 4.18.4 release notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/FalkorDB/FalkorDB/releases/tag/v4.18.4"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade FalkorDB to version 4.18.4 or later."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-04-24T00:00:00.000Z",
          "value": "Reported to FalkorDB"
        },
        {
          "lang": "en",
          "time": "2026-05-05T00:00:00.000Z",
          "value": "CVE ID shared with the vendor"
        },
        {
          "lang": "en",
          "time": "2026-05-07T00:00:00.000Z",
          "value": "Fix merged by the vendor (PR #1972)"
        },
        {
          "lang": "en",
          "time": "2026-05-07T00:00:00.000Z",
          "value": "FalkorDB 4.18.4 released with the fix"
        }
      ],
      "title": "Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB",
      "workarounds": [
        {
          "lang": "en",
          "value": "Require authentication on the Redis/FalkorDB instance (requirepass or ACLs), restrict or rename the REPLICAOF/SLAVEOF commands so untrusted clients cannot use them, and do not expose the instance to untrusted networks."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
    "assignerShortName": "securin",
    "cveId": "CVE-2026-7826",
    "datePublished": "2026-10-09T04:04:30.130Z",
    "dateReserved": "2026-05-05T02:50:40.051Z",
    "dateUpdated": "2026-10-09T04:04:30.130Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-FMQX-854H-CFFF

CVE-2026-7826 (GCVE-0-2026-7826)

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