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CVE-2026-119278

MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication

5.9 MediumFix available

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.36%Unchanged since Oct 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
CVE-2026-119278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-129, CWE-789
Updated
2026-11-02
EUVDEUVD-2026-113385 5.9

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
EUVD-2026-113385
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
NVD 5.9

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
CVE-2026-119278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-129, CWE-789
Updated
2026-11-02
OSV 5.9

MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
CVE-2026-119278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-129, CWE-789
Updated
2026-11-04
OSVDEBIAN-CVE-2026-119278 5.9

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
DEBIAN-CVE-2026-119278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-119278 5.9

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Record
UBUNTU-CVE-2026-119278
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
OSVopenSUSE-SU-2026:12401-1 No score

mariadb-java-client-3.5.11-1.1 on GA media

These are all security issues fixed in the mariadb-java-client-3.5.11-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12401-1
Updated
2026-11-04

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mariadb-connector-java
Debian:12
All versions, plus listed versions
2.7.15-12.7.6-13.5.10-1
None known
mariadb-connector-java
Debian:13
All versions, plus listed versions
2.7.15-12.7.6-13.5.10-1
None known
mariadb-connector-java
Debian:14
before 3.5.10-1, plus listed versions
2.7.15-12.7.6-1
3.5.10-1
mariadb-connector-java
Ubuntu:18.04:LTS
All versions, plus listed versions
2.3.0-1~18.04
None known
mariadb-connector-java
Ubuntu:20.04:LTS
All versions, plus listed versions
2.4.2-1build22.5.3-1
None known
mariadb-connector-java
Ubuntu:22.04:LTS
All versions, plus listed versions
2.7.2-12.7.4-1
None known
mariadb-connector-java
Ubuntu:24.04:LTS
All versions, plus listed versions
2.7.6-1
None known
mariadb-connector-java
Ubuntu:26.10
All versions, plus listed versions
2.7.6-1build1
None known
mariadb-connector-java
Ubuntu:26.04:LTS
All versions, plus listed versions
2.7.6-12.7.6-1build1
None known
mariadb-java-client
openSUSE:Tumbleweed
From an advisory covering 7 CVEs
before 3.5.11-1.1
3.5.11-1.1

History

History
RecordedChangedSources
affectedOSV
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-119278 is a medium vulnerability (CVSS 5.9) in Mariadb-corporation Mariadb-connector-j, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 30th percentile. Fixed in mariadb-connector-java 3.5.10-1.

References

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