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CVE-2026-21964

Fixed in a distro release EPSS <1%CVSS 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high privileged 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 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Published 2026-01-20 · CVE record · OSV

Products: Oracle Corporation MySQL Server

Distro releases

ReleasePackageFixed in
AlmaLinux 10mysql8.4-common8.4.8-1.el10_1
AlmaLinux 10mysql8.4-errmsg8.4.8-1.el10_1
AlmaLinux 10mysql8.4-test-data8.4.8-1.el10_1
AlmaLinux 8mecab0.996-2.module_el8.10.0+3965+b415b607
AlmaLinux 8mecab0.996-2.module_el8.10.0+4060+d4256e26
AlmaLinux 8mecab0.996-2.module_el8.6.0+3340+d764b636
AlmaLinux 8mecab-devel0.996-2.module_el8.10.0+4060+d4256e26
AlmaLinux 8mecab-devel0.996-2.module_el8.10.0+3965+b415b607
AlmaLinux 8mecab-devel0.996-2.module_el8.6.0+3340+d764b636
AlmaLinux 8mecab-ipadic2.7.0.20070801-17.module_el8.10.0+4060+d4256e26
AlmaLinux 8mecab-ipadic2.7.0.20070801-17.module_el8.10.0+4154+a69a9128
AlmaLinux 8mecab-ipadic2.7.0.20070801-17.module_el8.10.0+3965+b415b607
AlmaLinux 8mecab-ipadic2.7.0.20070801-17.module_el8.10.0+4142+0b28b031
AlmaLinux 8mecab-ipadic-EUCJP2.7.0.20070801-17.module_el8.10.0+4154+a69a9128
AlmaLinux 8mecab-ipadic-EUCJP2.7.0.20070801-17.module_el8.10.0+3965+b415b607
AlmaLinux 8mecab-ipadic-EUCJP2.7.0.20070801-17.module_el8.10.0+4142+0b28b031
AlmaLinux 8mecab-ipadic-EUCJP2.7.0.20070801-17.module_el8.10.0+4060+d4256e26
AlmaLinux 8mysql8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-common8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-common8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-devel8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-devel8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-errmsg8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-errmsg8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-libs8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-libs8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-server8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-server8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-test8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 8mysql-test8.0.45-1.module_el8.10.0+4142+0b28b031
AlmaLinux 8mysql-test-data8.4.8-1.module_el8.10.0+4154+a69a9128
AlmaLinux 9mecab0.996-3.module_el9.6.0+152+8cbce00c.4
AlmaLinux 9mecab-devel0.996-3.module_el9.6.0+152+8cbce00c.4
AlmaLinux 9mecab-ipadic2.7.0.20070801-24.module_el9.6.0+152+8cbce00c
AlmaLinux 9mecab-ipadic-EUCJP2.7.0.20070801-24.module_el9.6.0+152+8cbce00c
AlmaLinux 9mysql8.0.45-1.el9_7
AlmaLinux 9mysql8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-common8.0.45-1.el9_7
AlmaLinux 9mysql-common8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-devel8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-devel8.0.45-1.el9_7
AlmaLinux 9mysql-errmsg8.0.45-1.el9_7
AlmaLinux 9mysql-errmsg8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-libs8.0.45-1.el9_7
AlmaLinux 9mysql-libs8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-server8.0.45-1.el9_7
AlmaLinux 9mysql-server8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-test8.0.45-1.el9_7
AlmaLinux 9mysql-test8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9mysql-test-data8.4.8-1.module_el9.7.0+219+aca48cd3
AlmaLinux 9rapidjson-devel1.1.0-19.module_el9.6.0+152+8cbce00c
AlmaLinux 9rapidjson-doc1.1.0-19.module_el9.6.0+152+8cbce00c
Red Hat Enterprise Linux 10.1mysql8.40:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-common0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-debuginfo0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-debugsource0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-devel0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-devel-debuginfo0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-errmsg0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-libs0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-libs-debuginfo0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-server0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-server-debuginfo0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-test0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-test-data0:8.4.8-1.el10_1
Red Hat Enterprise Linux 10.1mysql8.4-test-debuginfo0:8.4.8-1.el10_1
Red Hat Enterprise Linux 8mecab0:0.996-2.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab0:0.996-2.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mecab-debuginfo0:0.996-2.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mecab-debuginfo0:0.996-2.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab-debugsource0:0.996-2.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab-debugsource0:0.996-2.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mecab-devel0:0.996-2.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab-devel0:0.996-2.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mecab-ipadic0:2.7.0.20070801-17.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab-ipadic0:2.7.0.20070801-17.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mecab-ipadic-EUCJP0:2.7.0.20070801-17.module+el8.10.0+23550+bd321b9a
Red Hat Enterprise Linux 8mecab-ipadic-EUCJP0:2.7.0.20070801-17.module+el8.10.0+22857+7f331edd
Red Hat Enterprise Linux 8mysql0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-common0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-common0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-debuginfo0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-debuginfo0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-debugsource0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-debugsource0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-devel0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-devel0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-devel-debuginfo0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-devel-debuginfo0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-errmsg0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-errmsg0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-libs0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-libs0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-libs-debuginfo0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-libs-debuginfo0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-server0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-server0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-server-debuginfo0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-server-debuginfo0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-test0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-test0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-test-data0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 8mysql-test-debuginfo0:8.0.45-1.module+el8.10.0+24016+b28eaa79
Red Hat Enterprise Linux 8mysql-test-debuginfo0:8.4.8-1.module+el8.10.0+24007+c07a67f2
Red Hat Enterprise Linux 9mecab0:0.996-3.module+el9.7.0+24088+36dcab8d.4
Red Hat Enterprise Linux 9mecab-debuginfo0:0.996-3.module+el9.7.0+24088+36dcab8d.4
Red Hat Enterprise Linux 9mecab-debugsource0:0.996-3.module+el9.7.0+24088+36dcab8d.4
Red Hat Enterprise Linux 9mecab-devel0:0.996-3.module+el9.7.0+24088+36dcab8d.4
Red Hat Enterprise Linux 9mecab-ipadic0:2.7.0.20070801-24.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mecab-ipadic-EUCJP0:2.7.0.20070801-24.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-common0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-common0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-debuginfo0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-debuginfo0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-debugsource0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-debugsource0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-devel0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-devel0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-devel-debuginfo0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-devel-debuginfo0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-errmsg0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-errmsg0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-libs0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-libs0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-libs-debuginfo0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-libs-debuginfo0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-server0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-server0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-server-debuginfo0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-server-debuginfo0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-test0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9mysql-test0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-test-data0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-test-debuginfo0:8.4.8-1.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9mysql-test-debuginfo0:8.0.45-1.el9_7
Red Hat Enterprise Linux 9rapidjson0:1.1.0-19.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9rapidjson-devel0:1.1.0-19.module+el9.7.0+24088+36dcab8d
Red Hat Enterprise Linux 9rapidjson-doc0:1.1.0-19.module+el9.7.0+24088+36dcab8d
Rocky Linux 10mysql8.40:8.4.8-1.el10_1.rocky.0.1
Rocky Linux 8mecab0:0.996-2.module+el8.10.0+1937+28fbbc83
Rocky Linux 8mecab0:0.996-2.module+el8.10.0+2091+db4d14f6
Rocky Linux 8mecab0:0.996-2.module+el8.10.0+1676+9b4b6e24
Rocky Linux 8mecab-ipadic0:2.7.0.20070801-17.module+el8.10.0+1937+28fbbc83
Rocky Linux 8mecab-ipadic0:2.7.0.20070801-17.module+el8.10.0+2091+db4d14f6
Rocky Linux 9mecab0:0.996-3.module+el9.7.0+40027+0df0d4e0.4
Rocky Linux 9mecab-ipadic0:2.7.0.20070801-24.module+el9.7.0+40027+0df0d4e0
Rocky Linux 9mysql0:8.0.45-1.el9_7
Rocky Linux 9rapidjson0:1.1.0-19.module+el9.7.0+40027+0df0d4e0
Ubuntu 14.04 LTSmysql-5.5no fix
Ubuntu 16.04 LTSpercona-server-5.6no fix
Ubuntu 16.04 LTSpercona-xtradb-cluster-5.6no fix
Ubuntu 20.04 LTSmariadb-10.3no fix
Ubuntu 22.04 LTSmysql-8.08.0.45-0ubuntu0.22.04.1
Ubuntu 24.04 LTSmysql-8.08.0.45-0ubuntu0.24.04.1
Ubuntu 25.10mysql-8.48.4.8-0ubuntu0.25.10.1
Ubuntu 26.04 LTSmysql-8.48.4.8-0ubuntu1
Ubuntu Pro 16.04 LTSmysql-5.7no fix
Ubuntu Pro 18.04 LTSmysql-5.7no fix
Ubuntu Pro 20.04 LTSmysql-8.08.0.45-0ubuntu0.20.04.1+esm2