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TI-2026-17663 Aliases CVE-2026-21964GHSA-jjjh-9j5x-gr7x

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread…

Priority LOW 23Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00404 34th percentileScored 2026-11-07
Fix Fixed Red Hat: 5 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OracleMySQL Server8.0.0 – 8.0.44; 8.4.0 – 8.4.7; 9.0.0 – 9.5.0—No fix listedCNA
  • MySQL Server VendorOracle Affected 8.0.0 – 8.0.44; 8.4.0 – 8.4.7; 9.0.0 – 9.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*8.0.0 – 8.0.44; 8.4.0 – 8.4.7; 9.0.0 – 9.5.0VulnerableOracle
  • cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:* Versions 8.0.0 – 8.0.44; 8.4.0 – 8.4.7; 9.0.0 – 9.5.0 Vulnerable ·Oracle

Remediation

Red Hat 5 advisories

  • RHSA-2026:6391 Released 2026-04-01 · Red Hat rating Moderate
    mysql:8.4 security update
    • Red Hat Enterprise Linux AppStream (v. 8) mecab-0.996-2.module+el8.10.0+23550+bd321b9a.aarch64::mysql:8.4, mecab-0.996-2.module+el8.10.0+23550+bd321b9a.ppc64le::mysql:8.4, mecab-0.996-2.module+el8.10.0+23550+bd321b9a.s390x::mysql:8.4 +39
  • RHSA-2026:5640 Released 2026-03-24 · Red Hat rating Moderate
    mysql:8.4 security update
    • Red Hat Enterprise Linux AppStream (v. 9) mecab-0.996-3.module+el9.7.0+24088+36dcab8d.4.aarch64::mysql:8.4, mecab-0.996-3.module+el9.7.0+24088+36dcab8d.4.ppc64le::mysql:8.4, mecab-0.996-3.module+el9.7.0+24088+36dcab8d.4.s390x::mysql:8.4 +45
  • RHSA-2026:5580 Released 2026-03-24 · Red Hat rating Moderate
    mysql:8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) mecab-0.996-2.module+el8.10.0+22857+7f331edd.aarch64::mysql:8.0, mecab-0.996-2.module+el8.10.0+22857+7f331edd.ppc64le::mysql:8.0, mecab-0.996-2.module+el8.10.0+22857+7f331edd.s390x::mysql:8.0 +44
Show 2 more Red Hat advisories
  • RHSA-2026:4828 Released 2026-03-17 · Red Hat rating Moderate
    mysql security update
    • Red Hat Enterprise Linux AppStream (v. 9) mysql-8.0.45-1.el9_7, mysql-common-8.0.45-1.el9_7, mysql-errmsg-8.0.45-1.el9_7 +2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) mysql-devel-8.0.45-1.el9_7, mysql-test-8.0.45-1.el9_7
  • RHSA-2026:4162 Released 2026-03-10 · Red Hat rating Moderate
    mysql8.4 security update
    • Red Hat Enterprise Linux AppStream (v. 10) mysql8.4-8.4.8-1.el10_1, mysql8.4-common-8.4.8-1.el10_1, mysql8.4-errmsg-8.4.8-1.el10_1 +2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) mysql8.4-devel-8.4.8-1.el10_1, mysql8.4-test-8.4.8-1.el10_1, mysql8.4-test-data-8.4.8-1.el10_1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Oracle MySQL Server — oracle.com/security-alerts/cpujan2026.html

    11 records Highest priority Priority LOW 11 LOW

    Other records, highest priority first

    • TI-2026-17667 Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).Priority LOW 29
    • TI-2026-17650 Uncontrolled resource consumption in Oracle MySQL ServerPriority LOW 29
    • TI-2026-17649 Uncontrolled resource consumption in Oracle MySQL ServerPriority LOW 29
    Show all 11 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:4162
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:5580, RHSA-2026:6391
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:4828, RHSA-2026:5640
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:4162
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:4828
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21964
  2. 2026-10-03 Alias added: GHSA-jjjh-9j5x-gr7x

References

Advisory 1

  • TI-2017-02794 Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server… CVSS 3.0HIGH 7.5
  • TI-2016-05707 Oracle MySQL through 5.5.52, 5.6.x through 5.6.33, and 5.7.x through 5.7.15; MariaDB… CVSS 3.0CRITICAL 9.8
  • TI-2003-00723 Buffer overflow in get_salt_from_password from sql_acl.cc for MySQL 4.0.14 and earlier… CVSS 2.0HIGH 9.0
  • TI-2020-04444 RFD Attack via "Content-Disposition" Header Sourced from Request Input by Spring MVC or Spring WebFlux Application CVSS 3.1HIGH 7.5
  • TI-2008-00208 Multiple buffer overflows in yaSSL 1.7.5 and earlier, as used in MySQL and possibly other… CVSS 2.0HIGH 7.5
  • TI-2020-01888 Segmentation fault in SSL_check_chain CVSS 3.1HIGH 7.5
See all 1327 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences