CVE-2026-106435 (GCVE-0-2026-106435)

Vulnerability from cvelistv5 – Published: 2026-10-08 20:12 – Updated: 2026-10-08 20:12
VLAI
Title
Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver
Summary
The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
Severity
5.9 (Medium)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.1 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
mongodb CNA under the mitre root
CNA scorecard C 70/100 over 200 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
MongoDB Python Driver Affected: 0.10.3 , ≤ 4.18.2 (semver)
guessed Create a notification for this product.
Show details on NVD website
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{
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            }
          ],
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "baseScore": 5.9,
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            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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            "version": "3.1"
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-10-08T20:12:15.074Z",
        "orgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
        "shortName": "mongodb"
      },
      "references": [
        {
          "url": "https://jira.mongodb.org/browse/PYTHON-6110"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
    "assignerShortName": "mongodb",
    "cveId": "CVE-2026-106435",
    "datePublished": "2026-10-08T20:12:15.074Z",
    "dateReserved": "2026-10-06T16:40:35.017Z",
    "dateUpdated": "2026-10-08T20:12:15.074Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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                    "status": "affected",
                    "version": "0.10.3",
                    "versionType": "semver"
                  }
                ]
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            ],
            "source": "cna@mongodb.com"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The MongoDB Python Driver\u0027s binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver\u0027s normal database wire-protocol path does not reach this code."
          }
        ],
        "id": "CVE-2026-106435",
        "lastModified": "2026-10-08T21:33:42.423",
        "metrics": {
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              },
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              "impactScore": 3.6,
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            }
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          "cvssMetricV40": [
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                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "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",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
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                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "source": "cna@mongodb.com",
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        "published": "2026-10-08T21:17:51.667",
        "references": [
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            "source": "cna@mongodb.com",
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      "current_release_date": "2026-10-08T23:46:33+00:00",
      "cve": "CVE-2026-106435",
      "id": "CVE-2026-106435",
      "initial_release_date": "2026-10-08T20:12:15.074000+00:00",
      "product_status:known_affected": "23",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "pymongo: pymongo: Denial of Service via out-of-bounds read during malformed BSON decoding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106435.json",
      "version": "3"
    }
  }
}



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