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TI-2026-17648 Aliases CVE-2026-21948GHSA-m9j9-cmf2-wc4j

Uncontrolled resource consumption in Oracle MySQL Server

Priority LOW 23CWE-400Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). 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 0.00401 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_server:*:*:*:*:*:*:*:*8.0.0 – 8.0.44; 8.4.0 – 8.4.7; 9.0.0 – 9.5.0VulnerableOracle
  • cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* 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-2026-21948
  2. 2026-10-03 Alias added: GHSA-m9j9-cmf2-wc4j

References

Advisory 1

  • TI-2021-02645 SM2 Decryption Buffer Overflow CVSS 3.1CRITICAL 9.8
  • TI-2022-01176 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
  • TI-2021-04451 XStream is vulnerable to an Arbitrary Code Execution attack CVSS 3.1CRITICAL 9.1
  • TI-2021-04444 XStream is vulnerable to an Arbitrary Code Execution attack CVSS 3.1CRITICAL 9.8
  • TI-2021-05762 Use after free in https://github.com/curl/curl CVSS 3.1HIGH 8.1
  • TI-2021-05807 Cleartext transmission of sensitive information in https://github.com/curl/curl CVSS 3.1HIGH 7.5
See all 347 →

Sources

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