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

Vulnerability from cvelistv5 – Published: 2026-10-09 04:04 – Updated: 2026-10-09 04:04
VLAI
Title
Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
Summary
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
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
Assigner
securin CNA under the mitre root
CNA scorecard B 80/100 over 70 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FalkorDB FalkorDB Affected: 0 , < 4.18.4 (semver)
    cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Arjun Basnet from Securin
Show details on NVD website
To clipboard 

{
  "containers": {
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      "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"
            }
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        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Arjun Basnet from Securin"
        }
      ],
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          "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": [
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            "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",
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      ],
      "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": [
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          ],
          "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"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-09",
      "epss": "0.00433",
      "percentile": "0.3566"
    },
    "nvd": {
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                "collectionURL": "https://github.com/FalkorDB/FalkorDB",
                "cpes": [
                  "cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unaffected",
                "modules": [
                  "RDB serializer / graph decoder"
                ],
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                ],
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                    "name": "BufferSerializerIOv2_ReadBuffer"
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                ],
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        "cveTags": [],
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          }
        ],
        "id": "CVE-2026-7826",
        "lastModified": "2026-10-09T05:16:45.270",
        "metrics": {
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                "confidentialityImpact": "HIGH",
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                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
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                "valueDensity": "NOT_DEFINED",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.



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