`CVE-2026-21950`

6.5 Medium Not applicable

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).

CWE-400 · Uncontrolled resource consumption

Exploitation Status

No public exploit

Nothing published shows this CVE being exploited, which is not the same as ruling it out.

CVSS E:U

CISA KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC none indexed
EPSS 0.34% chance in 30 days

Waratek Defense Posture

Not applicable

Not a Java vulnerability. Outside ARMR's domain entirely.

Protection none
Action not-needed none
Review automated upstream-data
Record active

Decided by non-java-upstream : A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

Finding Root cause is in an ignored upstream product (Oracle Corporation/MySQL Server). Common reasons: not a Java library, vulnerability is in native/C code, or product is outside ARMR's mitigation scope.

Decided by	`non-java-upstream` : A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime
Finding	Root cause is in an ignored upstream product (Oracle Corporation/MySQL Server). Common reasons: not a Java library, vulnerability is in native/C code, or product is outside ARMR's mitigation scope.

CVSS

6.5 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 1 metric

VRT selects the newest version's highest entry and publishes it as cvssScore, newest rather than largest because scores are not comparable across versions, and highest rather than first because the first entry is frequently a CNA placeholder scoring 0.0 over NVD's own analysis.

Version Score Band Vector Assigner Type

CVSS 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H secalert_us@oracle.com Secondary published

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`	secalert_us@oracle.com	Secondary	published

Affected Software & Releases

🏛️ Oracle CPU Advisories & Products

Advisory	Type	Quarter	Products Oracle named in risk matrix
Oracle Critical Patch Update January 2026 ↗	CPU	2026-Q1	Oracle MySQL / Server: Optimizer (9.0.0-9.5.0)

Advisory

Type

Quarter

Products Oracle named in risk matrix

Oracle Critical Patch Update January 2026 ↗

CPU

2026-Q1

Oracle MySQL / Server: Optimizer (9.0.0-9.5.0)

Indexed Oracle Components & Versions

Family	Component	Oracle's version cell (verbatim)	Indexed as
Oracle MySQL	Server: Optimizer	9.0.0-9.5.0

Family

Component

Oracle's version cell (verbatim)

Indexed as

Oracle MySQL

Server: Optimizer

9.0.0-9.5.0

🖥️ Product CPEs & Version Ranges

1 product(s) over 1 version claims (uncapped)

Source	Vendor	Product	Scheme	Affected Versions
nvd	oracle	mysql server	generic	≥ 9.0.0 and ≤ 9.5.0

Source

Vendor

Product

Scheme

Affected Versions

nvd

oracle

mysql server

generic

≥ 9.0.0 and ≤ 9.5.0

References

URL	Tags
https://www.oracle.com/security-alerts/cpujan2026.html	Vendor Advisory

URL

Timeline

Published 2026-01-20 Last modified 2026-06-17

Published	2026-01-20	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2026-01-20

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

Pipeline policy audit (6 of 21 rules evaluated)

6 of 21 rules ran. The rest were never reached, because an earlier stage settled the CVE, a distinct claim from a rule that ran and found nothing.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? first match wins

1 rejected no-match CVE Program withdrawal of this identifier

scope: Is the vulnerability ARMR's to address? first match wins

2 armr-patch-file no-match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no-match An ARMR security-rule template on disk for this CVE

4 manual-classification no-match A researcher's recorded decision for this specific CVE

5 manual classification no-match Manual classification of this CVE in the legacy dataset

6 non-java-upstream decided it matched Not applicable CNA-declared affected products are on the ignored list: Oracle Corporation/MySQL Server

7 oracle-component not-reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the native WebLogic proxy plug-in. Oracle gives these no CPE of their own and names them only in the description.

8 osv-maven not-reached An OSV.dev record of this CVE affecting a package published to Maven Central

9 cna-maven-package not-reached An affected Maven artifact named by the CNA itself

10 known-cpe-product not-reached An NVD CPE naming a product ARMR tracks

11 cna-cpe-product not-reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

12 oracle-advisory-family not-reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

13 non-deployable-product not-reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

14 unmatched-product not-reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? cumulative: every rule gets a turn

15 patch-hint not-reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

16 open-source-maven not-reached The affected package being open source on Maven, so the fix can be read

17 poc-derivable not-reached An indexed exploit to reverse-engineer, where there is no source to read

18 no-exploit not-reached With no fix path, a public exploit, or a CISA record of one

19 secure-rule-match not-reached A vulnerability class already blocked by an ARMR security rule

20 below-action-threshold not-reached Medium or Low severity, no KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

21 no-exploit-published not-reached A published working exploit for this candidate, not only a proof of concept, a forecast, or nothing at all

What the scope rules read

The products the record named, and whether known-products.yaml tracks them. This is the evidence the scope stage decided on.

Vendor Product Tracked CPE Source

Oracle Corporation MySQL Server not tracked

Raw stored JSON document for this CVE ↗ · NVD ↗ · CVE.org ↗