CVE-2026-107909 (GCVE-0-2026-107909)

Vulnerability from cvelistv5 – Published: 2026-10-09 05:08 – Updated: 2026-10-09 05:08
VLAI
Title
Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via unbounded payload length
Summary
A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly corrupt heap memory by sending a WebSocket frame with a 64-bit extended payload length to the Bolt port. The payload length is not bounded, and the only bounds check in buffer_apply_mask is an ASSERT(), which is compiled out in release builds, so the function XORs memory beyond the end of the receive buffer with the attacker-supplied mask key. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.
Severity
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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:N/I:H/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 , < 4.20.0 (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 

{
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          ],
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          "modules": [
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          ],
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          "programFiles": [
            "src/bolt/ws.c",
            "src/bolt/buffer.c"
          ],
          "programRoutines": [
            {
              "name": "ws_read_frame"
            },
            {
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            }
          ],
          "repo": "https://github.com/FalkorDB/FalkorDB",
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          "versions": [
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              "status": "affected",
              "version": "0",
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          "value": "A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly corrupt heap memory by sending a WebSocket frame with a 64-bit extended payload length to the Bolt port. The payload length is not bounded, and the only bounds check in buffer_apply_mask is an ASSERT(), which is compiled out in release builds, so the function XORs memory beyond the end of the receive buffer with the attacker-supplied mask key. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected."
        }
      ],
      "impacts": [
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          "name": "FalkorDB PR #2170",
          "tags": [
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          "url": "https://github.com/FalkorDB/FalkorDB/pull/2170"
        },
        {
          "name": "Fix commit",
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          "url": "https://github.com/FalkorDB/FalkorDB/commit/0b11a00b34b25c4d4fdfe55f0a35c8a00593bd7d"
        },
        {
          "name": "FalkorDB 4.20.0 release notes",
          "tags": [
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          "url": "https://github.com/FalkorDB/FalkorDB/releases/tag/v4.20.0"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade FalkorDB to version 4.20.0 or later. Bolt protocol support, including the code affected by this issue, was removed in 4.20.0."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
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          "time": "2026-06-29T00:00:00.000Z",
          "value": "Reported to FalkorDB"
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          "time": "2026-06-29T00:00:00.000Z",
          "value": "Vendor acknowledged the report"
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          "time": "2026-07-08T00:00:00.000Z",
          "value": "Vendor removed Bolt protocol support (PR #2170)"
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        {
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          "time": "2026-07-13T00:00:00.000Z",
          "value": "FalkorDB 4.20.0 released without Bolt support"
        },
        {
          "lang": "en",
          "time": "2026-09-27T00:00:00.000Z",
          "value": "Coordinated disclosure period ended"
        }
      ],
      "title": "Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via unbounded payload length",
      "workarounds": [
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          "lang": "en",
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        }
      ]
    }
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    "datePublished": "2026-10-09T05:08:12.082Z",
    "dateReserved": "2026-10-09T04:54:48.677Z",
    "dateUpdated": "2026-10-09T05:08:12.082Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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          }
        ],
        "id": "CVE-2026-107909",
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                "exploitMaturity": "NOT_DEFINED",
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                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
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                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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}



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