Unspecified vulnerability in Oracle MySQL 5.6.29 and earlier and 5.7.11 and earlier allows remote attackers to affect confidentiality, integrity, and availability via vectors related to Pluggable Authentication.

As per Upstream advisory:

A double free bug was discovered when OpenSSL parses malformed DSA private keys and could lead to a DoS attack or memory corruption for applications that receive DSA private keys from untrusted sources. This scenario is considered rare.

This issue affects OpenSSL versions 1.0.2 and 1.0.1.

OpenSSL 1.0.2 users should upgrade to 1.0.2g OpenSSL 1.0.1 users should upgrade to 1.0.1s

This issue was reported to OpenSSL on 7th February 2016 by Adam Langley (Google/BoringSSL) using libFuzzer. The fix was developed by Dr Stephen Henson of OpenSSL.

An old inffast.c optimization turns out to not be optimal anymore with modern compilers, and furthermore was not compliant with the C standard, for which decrementing a pointer before its allocated memory is undefined.

External References:

https://wiki.mozilla.org/images/0/09/Zlib-report.pdf https://docs.google.com/document/d/10i1KZS5so8xDqH2rplRa2xet0tyTvvJlLbQQmZIUIKE/edit#heading=h.t13tvnx4loq7

Upstream patch:

https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb

CVE assignment:

http://seclists.org/oss-sec/2016/q4/602

Last updated 14 January 2026

inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic

Last updated 11 July 2025

It was discovered that the MySQL's sha256password authentication plugin did not restrict the length password received from authenticating client before passing it to the mycryptgenhash() function. This function implements SHA256 crypt password hashing algorithm that can also be used for hashing passwords in /etc/shadow on Linux systems. The algorithm is computationally intensive, and an excessively long passwords cause mysqld thread handling specific connection to consume all available CPU time. Additionally, the algorithm implementation in MySQL uses alloca() for memory allocation, which does not protect against stack overflow, possibly leading to memory corruption, process crash, and potentially code execution.

Note that this issue affects deployments where non-default sha256password authentication is configured for some or all database users.

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Pluggable Auth). Supported versions that are affected are 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). NOTE: the previous information is from the April 2017 CPU. Oracle has not commented on third-party claims that this issue is an integer overflow in sql/auth/sqlauthentication.cc which allows remote attackers to cause a denial of service via a crafted authentication packet.

Last updated 18 August 2025

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. While the vulnerability is in MySQL Server, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: DML). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. While the vulnerability is in MySQL Server, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).

Buffer overflow in client/mysql.cc in Oracle MySQL and MariaDB before 5.5.35 allows remote database servers to cause a denial of service (crash) and possibly execute arbitrary code via a long server version string.

Last updated 18 August 2025

Last updated 18 August 2025

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Thread Pooling). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Memcached). Supported versions that are affected are 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A use-after-free flaw was found in the MySQL client library (libmysqlclient.so). A malicious MySQL server could cause an application using the MySQL client library to crash.

Upstream bugs:

https://bugs.mysql.com/bug.php?id=70429 https://bugs.mysql.com/bug.php?id=63363

Upstream patch:

https://github.com/mysql/mysql-server/commit/4797ea0b772d5f4c5889bc552424132806f46e93

Unspecified vulnerability in Oracle MySQL 5.5.45 and earlier and 5.6.26 and earlier allows local users to affect confidentiality, integrity, and availability via vectors related to Server: Option.

Last updated 18 August 2025

Last updated 18 August 2025

Unspecified vulnerability in Oracle MySQL 5.6.10 and earlier allows remote authenticated users to affect availability via unknown vectors related to Data Manipulation Language, a different vulnerability than CVE-2013-1567.

Last updated 18 August 2025

Last updated 18 August 2025

Last updated 18 August 2025

Last updated 18 August 2025

An unspecified vulnerability in Oracle MySQL Server related to the Server: Optimizer component could allow an authenticated attacker to cause a denial of service resulting in a high availability impact using unknown attack vectors.

Last updated 18 August 2025

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Security: Encryption). Supported versions that are affected are 5.6.34 and earlier and 5.7.16 and earlier. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in MySQL Server, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS v3.0 Base Score 6.8 (Availability impacts).

Unspecified vulnerability in Oracle MySQL 5.6.30 and earlier and 5.7.12 and earlier allows remote authenticated users to affect availability via vectors related to Server: FTS.

MySQL versions 5.5.52, 5.6.33, and 5.7.15 corrected a flaw in the way error log file was handled by mysqldsafe script. The issue allows mysql system user to escalate their privileges to root, and got two CVE ids assigned - CVE-2016-6664 and CVE-2016-5617 - see bug 1386564.

The original fix was applied as part of the patch for another issue - CVE-2016-6662:

https://github.com/mysql/mysql-server/commit/684a165f28b3718160a3e4c5ebd18a465d85e97c

The fix attempted to prevent script from using touch/chown/chmod on the configured log file if it was a symbolic link. This fix was found to be incomplete and having the following issues:

- Fix was racy, and the race was quite easy to win. Changing ownership and mode of arbitrary files was still possible.

- After the fix, mysqldsafe no longer tried to change ownership or mode of the log file if it was symlink, but it still used the file for logging and written new log entries to it. This allowed arbitrary file corruption, at least.

- It was possible to set log-error to point to arbitrary file, bypassing symlinks checks added by the fix.

These additional problems were corrected in versions 5.5.54, 5.6.35, and 5.7.17:

Unsafe use of rm and chown in mysqldsafe could result in privilege escalation. chown now can be used only when the target directory is /var/log. An incompatible change is that if the directory for the Unix socket file is missing, it is no longer created; instead, an error occurs. Due to these changes, /bin/bash is required to run mysqldsafe on Solaris. /bin/sh is still used on other Unix/Linux platforms.

http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-54.html http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-35.html http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-17.html

via the following commit:

https://github.com/mysql/mysql-server/commit/1f93f4381b60e3a8012ba36a4dec920416073759

This fix, however, effectively disables mysqldsafe's logging to file if the script is running as root.