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MariaDB EUVDEUVD-2026-18595

| CVE-2026-35549 MEDIUM
Memory Allocation with Excessive Size Value (CWE-789)
2026-04-03 mitre GHSA-3xgj-m9hf-j98g
Denial Of Service MariaDB
6.5
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
11.4.10,11.8.6,12.2.2
EUVD ID Assigned
Apr 03, 2026 - 05:15 euvd
EUVD-2026-18595
Analysis Generated
Apr 03, 2026 - 05:15 vuln.today
CVE Published
Apr 03, 2026 - 05:00 nvd
MEDIUM 6.5

DescriptionCVE.org

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.

AnalysisAI

Denial of service in MariaDB Server through large packet crashes when the caching_sha2_password authentication plugin is enabled and accounts use it, due to unbounded stack allocation in sha256_crypt_r. Authenticated remote attackers can crash the server by sending a crafted large authentication packet. MariaDB versions before 11.4.10, 11.5.0 through 11.8.5, and 12.0.0 through 12.2.1 are affected. No public exploit code or confirmed active exploitation reported at time of analysis.

Technical ContextAI

The vulnerability stems from CWE-789 (Uncontrolled Allocation of Resources with Externally Controlled Size), specifically the use of alloca() in the sha256_crypt_r function within the caching_sha2_password authentication plugin. The alloca() function allocates memory on the stack rather than the heap, and does not perform bounds checking. When processing authentication packets of attacker-controlled size, an excessively large packet causes alloca() to attempt allocation of excessive stack memory, leading to stack overflow and server crash. This affects the authentication pathway before full authorization checks, making it reachable by any authenticated user account on the MariaDB instance. The caching_sha2_password plugin must be installed and at least one user account must be configured to use it as their authentication method for the vulnerability to be exploitable.

RemediationAI

Vendor-released patches are available: upgrade to MariaDB 11.4.10, 11.8.6, or 12.2.2 depending on your current version branch. Organizations unable to immediately patch should disable the caching_sha2_password authentication plugin if not required, or configure database access controls to restrict authentication attempts to trusted networks only, reducing exposure to remote attackers. Patch availability and detailed upgrade instructions are provided in the upstream MariaDB issue tracker at https://jira.mariadb.org/browse/MDEV-38365.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.1 Fixed

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EUVD-2026-18595 vulnerability details – vuln.today
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