CVE-2026-55858

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Source
https://cve.org/CVERecord?id=CVE-2026-55858
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55858.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55858
Aliases
Downstream
Related
Published
2026-08-28T22:46:40.114Z
Modified
2026-08-30T08:17:20.225480Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb-java-client
Details

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to charactersetclient through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If charactersetclient changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55858.json",
    "cwe_ids": [
        "CWE-838"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/mariadb-corporation/mariadb-connector-j

Affected ranges

Type
GIT
Repo
https://github.com/mariadb-corporation/mariadb-connector-j
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
6f7aba384d47f97c4e4e98b19f677415c7084db7
Introduced
c19f608838fdcb18fa81cab8a607afdaa5131a58
Introduced
8be57f3b4bd0b1112cf871d9426beda6919b3bb7
Fixed
defeee068496e3f6312e775c7de864f1b06388d4
Fixed
f522a2f560c6e07d1d4b9a7957ed31bc57038af4
Fixed
606bb6d6cf8fc02dc723ec468b5f753680da0993
Fixed
df4ebe2c61293b7a79ab9dd440199544305d1f38
Fixed
300716bef1e1d0370a41be7863b88aa2d55fbb69
Fixed
7b3c69221b5463ee03472654040b3f6b9e5329c7
Fixed
8cfd9df697372ad4ed09fe87a34b34babb6d43d6
Fixed
c555c9b477521be0c35c3a5461f9f46681553607
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.7.14"
        },
        {
            "introduced": "3.0.0-alpha"
        },
        {
            "fixed": "3.3.5"
        },
        {
            "introduced": "3.4.0"
        },
        {
            "fixed": "3.4.3"
        },
        {
            "introduced": "3.5.0"
        },
        {
            "fixed": "3.5.9"
        }
    ]
}

Affected versions

1.*
1.1.8
1.1.9
1.2.0
1.2.2
1.3.0
1.3.0-beta-1
1.3.0-beta-2
1.3.0-beta-3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
1.3.7
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
1.5.3
1.5.5
1.5.6
1.5.8
1.5.9
2.*
2.0.0-RC
2.1.2
2.2.0
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.3.0
2.4.0
2.5.1
2.5.2
2.5.3
2.7.10
2.7.11
2.7.12
2.7.13
2.7.3
2.7.4
2.7.5
2.7.6
2.7.7
2.7.8
2.7.9
3.*
3.0.0-alpha
3.0.3
3.0.6
3.0.7
3.0.8
3.0.9
3.1.3
3.1.4
3.3.1
3.3.2
3.3.3
3.3.4
3.4.0
3.4.1
3.4.2
3.5.0
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.7
3.5.8

Database specific

vanir_signatures 
[
    {
        "id": "CVE-2026-55858-00ee3674",
        "target": {
            "function": "readOkPacket",
            "file": "src/main/java/org/mariadb/jdbc/internal/protocol/AbstractQueryProtocol.java"
        },
        "deprecated": false,
        "digest": {
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            "length": 392.0
        },
        "signature_version": "v1",
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-55858-018483af",
        "target": {
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        },
        "deprecated": false,
        "digest": {
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        "signature_type": "Line"
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    {
        "id": "CVE-2026-55858-0460b895",
        "target": {
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        },
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-55858-0500d8df",
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        },
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        "signature_type": "Function"
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-55858-1f420e00",
        "target": {
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        },
        "deprecated": false,
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    {
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        "target": {
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        "signature_type": "Line"
    },
    {
        "id": "CVE-2026-55858-245b67a4",
        "target": {
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            "file": "src/main/java/org/mariadb/jdbc/internal/protocol/AbstractConnectProtocol.java"
        },
        "deprecated": false,
        "digest": {
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-55858-25484f2c",
        "target": {
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            "file": "src/main/java/org/mariadb/jdbc/client/context/BaseContext.java"
        },
        "deprecated": false,
        "digest": {
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        "signature_type": "Function"
    },
    {
        "id": "CVE-2026-55858-31bdda68",
        "target": {
            "file": "src/main/java/org/mariadb/jdbc/client/context/RedoContext.java"
        },
        "deprecated": false,
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    {
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        "target": {
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        },
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    {
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                "262020730538650889470913988487017122045",
                "33159305171354859900949693092562750988"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607",
        "signature_type": "Line"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55858.json"
vanir_signatures_modified 
"2026-08-30T08:17:20Z"