MariaDB up to 11.4.9/11.8.5/12.2.1 Authentication Plugin caching_sha2_password memory allocation

Summaryinfo

A vulnerability marked as problematic has been reported in MariaDB up to 11.4.9/11.8.5/12.2.1. The impacted element is the function caching_sha2_password of the component Authentication Plugin. Performing a manipulation results in memory allocation. This vulnerability is known as CVE-2026-35549. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in MariaDB up to 11.4.9/11.8.5/12.2.1. It has been classified as problematic. This affects the function caching_sha2_password of the component Authentication Plugin. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. The summary by CVE is:

An issue was discovered in MariaDB Server before 11.4.10, 11.5.x through 11.8.x before 11.8.6, and 12.x before 12.2.2. If the caching_sha2_password authentication plugin is installed, and some user accounts are configured to use it, a large packet can crash the server because sha256_crypt_r uses alloca.

The advisory is shared at jira.mariadb.org. This vulnerability is uniquely identified as CVE-2026-35549 since 04/03/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 305108 (Linux Distros Unpatched Vulnerability : CVE-2026-35549), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 11.4.10, 11.8.6 or 12.2.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (305108) and EUVD (EUVD-2026-18595). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Database Software

Name

• MariaDB

Version

• 11.4.0
• 11.4.1
• 11.4.2
• 11.4.3
• 11.4.4
• 11.4.5
• 11.4.6
• 11.4.7
• 11.4.8
• 11.4.9
• 11.8.0
• 11.8.1
• 11.8.2
• 11.8.3
• 11.8.4
• 11.8.5
• 12.2.0
• 12.2.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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