How severe is CVE-2026-21950?

CVE-2026-21950 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-21950 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21950?

CVE-2026-21950 affects Oracle Mysql Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21950?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21950 have an EU (EUVD) identifier?

Yes. CVE-2026-21950 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3559.

When was CVE-2026-21950 published?

CVE-2026-21950 was published on 2026-01-20 and last updated on 2026-06-17.

CVE-2026-21950

CVE-2026-21950 is a medium-severity vulnerability in Oracle Mysql Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3559
Weakness: CWE-400
Affected product: Oracle Mysql Server
Published: 2026-01-20
Last modified: 2026-06-17

Description

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 9.0.0-9.5.0. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Frequently asked questions

What is CVE-2026-21950?: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 9.0.0-9.5.0. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
How severe is CVE-2026-21950?: CVE-2026-21950 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-21950 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21950?: CVE-2026-21950 affects Oracle Mysql Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21950?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21950 have an EU (EUVD) identifier?: Yes. CVE-2026-21950 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3559.
When was CVE-2026-21950 published?: CVE-2026-21950 was published on 2026-01-20 and last updated on 2026-06-17.

References

https://www.oracle.com/security-alerts/cpujan2026.html

Affected products (1)

cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*

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