Vulnerability-Lookup

CVE-2026-55855 (GCVE-0-2026-55855)

Vulnerability from cvelistv5 – Published: 2026-08-28 22:06 – Updated: 2026-08-28 22:06

Title

MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets

Summary

MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.

Severity

6.5 (Medium)


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

CWE

CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-116 - Improper Encoding or Escaping of Output

Assigner

GitHub_M mitre root

References

10 references

URL	Tags
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_CONFIRM
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://github.com/mariadb-corporation/mariadb-co…	x_refsource_MISC
https://jira.mariadb.org/browse/CONJS-350	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
mariadb-corporation	mariadb-connector-nodejs	Affected: < 3.2.4 Affected: >= 3.3.0, < 3.3.3 Affected: >= 3.4.0, < 3.4.6 Affected: >= 3.5.0, < 3.5.3	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mariadb-connector-nodejs",
          "vendor": "mariadb-corporation",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.2.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.3.0, \u003c 3.3.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.4.0, \u003c 3.4.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.5.0, \u003c 3.5.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-89",
              "description": "CWE-89: Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116: Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T22:06:42.810Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6"
        },
        {
          "name": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3"
        },
        {
          "name": "https://jira.mariadb.org/browse/CONJS-350",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://jira.mariadb.org/browse/CONJS-350"
        }
      ],
      "source": {
        "advisory": "GHSA-g5xc-5w98-jfvm",
        "discovery": "UNKNOWN"
      },
      "title": "MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55855",
    "datePublished": "2026-08-28T22:06:42.810Z",
    "dateReserved": "2026-06-17T16:44:40.995Z",
    "dateUpdated": "2026-08-28T22:06:42.810Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55855\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-28T23:17:08.353\",\"lastModified\":\"2026-08-28T23:17:08.353\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"mariadb-corporation\",\"product\":\"mariadb-connector-nodejs\",\"versions\":[{\"version\":\"\u003c 3.2.4\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.3.0, \u003c 3.3.3\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.4.0, \u003c 3.4.6\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.5.0, \u003c 3.5.3\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":4.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-89\"},{\"lang\":\"en\",\"value\":\"CWE-116\"}]}],\"references\":[{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://jira.mariadb.org/browse/CONJS-350\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-55855

Vulnerability from fkie_nvd - Published: 2026-08-28 23:17 - Updated: 2026-08-28 23:17

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3
	security-advisories@github.com	https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm
	security-advisories@github.com	https://jira.mariadb.org/browse/CONJS-350

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mariadb-connector-nodejs",
          "vendor": "mariadb-corporation",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.2.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.3.0, \u003c 3.3.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.4.0, \u003c 3.4.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.5.0, \u003c 3.5.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3."
    }
  ],
  "id": "CVE-2026-55855",
  "lastModified": "2026-08-28T23:17:08.353",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-28T23:17:08.353",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://jira.mariadb.org/browse/CONJS-350"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-89"
        },
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-G5XC-5W98-JFVM

Vulnerability from github – Published: 2026-08-28 22:53 – Updated: 2026-08-28 22:53

Summary

MariaDB has possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets

Details

Summary

A SQL injection is possible when the connector escapes Buffer parameters client-side under a multi-byte client character set whose trail-byte range overlaps the ASCII backslash (0x5C): big5, gbk, sjis, cp932, and gb18030. Under these charsets, an attacker-controlled lead byte can absorb the escape byte the connector inserts, leaving the following quote unescaped so it terminates the string literal and injected SQL is parsed.

Details

When binding a Buffer (binary) parameter, the connector escapes the value byte-by-byte, inserting a backslash (0x5C) before quote (0x27) and backslash bytes. This is correct under single-byte and UTF-8–family charsets, but unsafe under client charsets whose multi-byte trail-byte range includes 0x5C.

On the server, the SQL lexer performs multi-byte character recognition (my_ismbchar) before it interprets escape sequences. If character_set_client is one of the affected charsets and the attacker controls a byte the lexer treats as a valid lead byte, the sequence <0x5C> is consumed as a single multi-byte character. The escaping backslash inserted by the connector is swallowed as that character's trail byte, so the following 0x27 is no longer escaped — it closes the string literal, and the remaining bytes are parsed as SQL.

This is the well-known multi-byte escaping bypass (the same class that historically affected addslashes / mysql_real_escape_string under GBK/Big5), here applied to the connector's client-side Buffer escaping path.

Am I affected?

You are affected if all of the following hold:

You use mariadb Connector/Node.js at a version below the patched releases listed below. The connection's client character set is one of big5, gbk, sjis, cp932, or gb18030. This is not the default (the default is utf8mb4). Untrusted data can reach a Buffer-typed query parameter.

Applications using utf8mb4 (or any charset whose trail-byte range does not include 0x5C) are not affected by this vector. Parameters bound through the binary/server-side prepared-statement path are also not affected, because those values are sent out-of-band and are never escaped into the SQL text.

Impact

SQL injection. An attacker able to influence the contents of a Buffer parameter can break out of the intended string literal and inject arbitrary SQL, leading to unauthorized read or modification of data and, depending on the database account's privileges, further compromise.

Patches

Fixed in 3.2.4, 3.3.3, 3.4.6, and 3.5.3. Upgrade to the patched release on your branch:

3.5.x → 3.5.3
3.4.x → 3.4.6
3.3.x → 3.3.3
3.2.x and earlier → 3.2.4 (or any newer release)

Workarounds

If you cannot upgrade immediately:

Use server-side prepared statements (execute) so parameters are bound via the binary protocol rather than escaped into the SQL text. Avoid passing untrusted data as Buffer parameters under the affected charsets.

Credit

Reported by Yalguun Tumenkhuu (@fg0x0).

Severity

6.5 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "mariadb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 3.3.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "mariadb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.3.0"
            },
            {
              "fixed": "3.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "mariadb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "3.4.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "mariadb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0"
            },
            {
              "fixed": "3.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55855"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-89"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-28T22:53:12Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nA SQL injection is possible when the connector escapes Buffer parameters client-side under a multi-byte client character set whose trail-byte range overlaps the ASCII backslash (0x5C): big5, gbk, sjis, cp932, and gb18030. Under these charsets, an attacker-controlled lead byte can absorb the escape byte the connector inserts, leaving the following quote unescaped so it terminates the string literal and injected SQL is parsed.\n\n### Details\n\nWhen binding a Buffer (binary) parameter, the connector escapes the value byte-by-byte, inserting a backslash (0x5C) before quote (0x27) and backslash bytes. This is correct under single-byte and UTF-8\u2013family charsets, but unsafe under client charsets whose multi-byte trail-byte range includes 0x5C.\n\nOn the server, the SQL lexer performs multi-byte character recognition (my_ismbchar) before it interprets escape sequences. If character_set_client is one of the affected charsets and the attacker controls a byte the lexer treats as a valid lead byte, the sequence \u003clead-byte\u003e\u003c0x5C\u003e is consumed as a single multi-byte character. The escaping backslash inserted by the connector is swallowed as that character\u0027s trail byte, so the following 0x27 is no longer escaped \u2014 it closes the string literal, and the remaining bytes are parsed as SQL.\n\nThis is the well-known multi-byte escaping bypass (the same class that historically affected addslashes / mysql_real_escape_string under GBK/Big5), here applied to the connector\u0027s client-side Buffer escaping path.\n\n### Am I affected?\n\nYou are affected if all of the following hold:\n\n\nYou use mariadb Connector/Node.js at a version below the patched releases listed below.\nThe connection\u0027s client character set is one of big5, gbk, sjis, cp932, or gb18030. This is not the default (the default is utf8mb4).\nUntrusted data can reach a Buffer-typed query parameter.\n\n\nApplications using utf8mb4 (or any charset whose trail-byte range does not include 0x5C) are not affected by this vector. Parameters bound through the binary/server-side prepared-statement path are also not affected, because those values are sent out-of-band and are never escaped into the SQL text.\n\n### Impact\n\nSQL injection. An attacker able to influence the contents of a Buffer parameter can break out of the intended string literal and inject arbitrary SQL, leading to unauthorized read or modification of data and, depending on the database account\u0027s privileges, further compromise.\n\n### Patches\n\nFixed in 3.2.4, 3.3.3, 3.4.6, and 3.5.3. Upgrade to the patched release on your branch:\n\n\n* 3.5.x \u2192 3.5.3\n* 3.4.x \u2192 3.4.6\n* 3.3.x \u2192 3.3.3\n* 3.2.x and earlier \u2192 3.2.4 (or any newer release)\n\n\n### Workarounds\n\nIf you cannot upgrade immediately:\n\nUse server-side prepared statements (execute) so parameters are bound via the binary protocol rather than escaped into the SQL text.\nAvoid passing untrusted data as Buffer parameters under the affected charsets.\n\n\nCredit\n\nReported by Yalguun Tumenkhuu ([@fg0x0](https://github.com/fg0x0/)).",
  "id": "GHSA-g5xc-5w98-jfvm",
  "modified": "2026-08-28T22:53:12Z",
  "published": "2026-08-28T22:53:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/0148cadba48064d430902678bbc5b4b62dc1c04f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mariadb-corporation/mariadb-connector-nodejs"
    },
    {
      "type": "WEB",
      "url": "https://jira.mariadb.org/browse/CONJS-350"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "MariaDB has  possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets"
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-55855 (GCVE-0-2026-55855)

FKIE_CVE-2026-55855

GHSA-G5XC-5W98-JFVM

Summary

Details

Am I affected?

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature