CVE-2026-35549Network attack vector

Authenticated server crash via oversized SHA-2 packet

Published Apr 3, 2026 · Updated Apr 3, 2026

Denial of service in MariaDB Server before 11.4.10, 11.5.0 through 11.8.5, and 12.0.0 through 12.2.1 allows remote authenticated users to crash it. The plugin's auth() function passes the attacker-controlled packet length to sha256_crypt_r(), whose alloca() call reserves that amount on the stack. The plugin is not installed by default, and exploitation requires an account configured to use it; stack exhaustion terminates the database server.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in MariaDB Server before 11.4.10, 11.5.0 through 11.8.5, and 12.0.0 through 12.2.1 allows remote authenticated users to crash it. The plugin's auth() function passes the attacker-controlled packet length to sha256_crypt_r(), whose alloca() call reserves that amount on the stack. The plugin is not installed by default, and exploitation requires an account configured to use it; stack exhaustion terminates the database server.

The record

CVE
CVE-2026-35549
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
MariaDB
Product
MariaDB Server
Classifications
CWE-789, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <11.4.10
  2. Affected versionversion=11.5.0 <11.8.6
  3. Affected versionversion=12.0.0 <12.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MariaDB · MariaDB Serverversion=0 <11.4.10; version=11.5.0 <11.8.6; version=12.0.0 <12.2.2

Published CVSS scores

6.5MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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