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CVE-2026-22009· NVD / CVE Program· CNA oracle

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. 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).

MediumCVSS 6.5 · v3.1—Proof of concept Fix available
Published
Apr 21, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 21th percentile
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Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · oracle
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
oraclemysql server

Using mysql server? Add it to your stack and be the first to know about CVEs like this one. (MySQL)

Add to my stack

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • oracle mysql server8.0.0 and later · up to 8.0.45 inclusive
  • oracle mysql server8.4.0 and later · up to 8.4.8 inclusive
  • oracle mysql server9.0.0 and later · up to 9.6.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (oracle). Independent of NVD's CPE analysis and usually ahead of it.

  • Oracle Corporation MySQL Server

    • 8.0.0 and later · up to and including 8.0.45affected
    • 8.4.0 and later · up to and including 8.4.8affected
    • 9.0.0 and later · up to and including 9.6.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10mysql8.4before 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-commonbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-develbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-errmsgbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-libsbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-serverbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-testbefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:10mysql8.4-test-databefore 8.4.9-1.el10_2.alma.18.4.9-1.el10_2.alma.1
AlmaLinux:8mecabbefore 0.996-2.module_el8.10.0+3965+b415b6070.996-2.module_el8.10.0+3965+b415b607
AlmaLinux:8mecabbefore 0.996-2.module_el8.10.0+4060+d4256e260.996-2.module_el8.10.0+4060+d4256e26
AlmaLinux:8mecabbefore 0.996-2.module_el8.6.0+3340+d764b6360.996-2.module_el8.6.0+3340+d764b636
AlmaLinux:8mecab-develbefore 0.996-2.module_el8.6.0+3340+d764b6360.996-2.module_el8.6.0+3340+d764b636
AlmaLinux:8mecab-develbefore 0.996-2.module_el8.10.0+3965+b415b6070.996-2.module_el8.10.0+3965+b415b607
AlmaLinux:8mecab-develbefore 0.996-2.module_el8.10.0+4060+d4256e260.996-2.module_el8.10.0+4060+d4256e26
AlmaLinux:8mecab-ipadicbefore 2.7.0.20070801-17.module_el8.10.0+3965+b415b6072.7.0.20070801-17.module_el8.10.0+3965+b415b607
AlmaLinux:8mecab-ipadicbefore 2.7.0.20070801-17.module_el8.10.0+4154+a69a91282.7.0.20070801-17.module_el8.10.0+4154+a69a9128
AlmaLinux:8mecab-ipadicbefore 2.7.0.20070801-17.module_el8.10.0+4060+d4256e262.7.0.20070801-17.module_el8.10.0+4060+d4256e26
AlmaLinux:8mecab-ipadicbefore 2.7.0.20070801-17.module_el8.10.0+4142+0b28b0312.7.0.20070801-17.module_el8.10.0+4142+0b28b031
AlmaLinux:8mecab-ipadic-EUCJPbefore 2.7.0.20070801-17.module_el8.10.0+4142+0b28b0312.7.0.20070801-17.module_el8.10.0+4142+0b28b031
AlmaLinux:8mecab-ipadic-EUCJPbefore 2.7.0.20070801-17.module_el8.10.0+4154+a69a91282.7.0.20070801-17.module_el8.10.0+4154+a69a9128
AlmaLinux:8mecab-ipadic-EUCJPbefore 2.7.0.20070801-17.module_el8.10.0+4060+d4256e262.7.0.20070801-17.module_el8.10.0+4060+d4256e26
AlmaLinux:8mecab-ipadic-EUCJPbefore 2.7.0.20070801-17.module_el8.10.0+3965+b415b6072.7.0.20070801-17.module_el8.10.0+3965+b415b607
AlmaLinux:8mysqlbefore 8.0.46-1.module_el8.10.0+4192+724bc6648.0.46-1.module_el8.10.0+4192+724bc664
AlmaLinux:8mysqlbefore 8.4.9-1.module_el8.10.0+4193+cbb8e7288.4.9-1.module_el8.10.0+4193+cbb8e728

+96

Same product

oracle: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-2429Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB).
    35Monitor
  • CVE-2026-60163Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Group Replication Plugin).
    33Monitor
  • CVE-2026-60315Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: X Plugin).
    32Monitor
  • CVE-2021-35583Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Windows).
    31Monitor
  • CVE-2025-21521Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling).
    30Monitor
  • CVE-2023-21912Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Security: Privileges).
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:mysql8.0.46-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:mysql-common8.0.46-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:mysql-devel8.0.46-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:mysql-errmsg8.0.46-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:mysql8.48.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-common8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-devel8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-errmsg8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-libs8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-server8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-test8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:mysql8.4-test-data8.4.9-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
red hat:mysql8.40:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-common0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-debuginfo0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-debugsource0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-devel0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-devel-debuginfo0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-errmsg0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-libs0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-libs-debuginfo0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-server0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-server-debuginfo0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:mysql8.4-test-debuginfo0:8.4.9-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:mecab0:0.996-3.module+el9.8.0+40162+a76274f1.4 · Rocky Linux:9Package registry (OSV)
rocky linux:mecab-ipadic0:2.7.0.20070801-24.module+el9.8.0+40162+a76274f1 · Rocky Linux:9Package registry (OSV)
rocky linux:mysql0:8.0.46-1.el9_8.rocky.0.1 · Rocky Linux:9Package registry (OSV)
rocky linux:mysql8.40:8.4.9-1.el10_2.rocky.0.1 · Rocky Linux:10Package registry (OSV)
rocky linux:perl-DBD-MySQL0:4.053-3.module+el9.8.0+40162+a76274f1 · Rocky Linux:9Package registry (OSV)
rocky linux:rapidjson0:1.1.0-19.module+el9.8.0+40162+a76274f1 · Rocky Linux:9Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-08-04

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+104 d
  3. TodaySep 30, 2026+162 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-220170 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).
    26Monitor
  • CVE-2026-342710 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin).
    26Monitor
  • CVE-2026-342720 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).
    26Monitor
  • CVE-2026-342760 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin).
    26Monitor
  • CVE-2026-343030 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).
    26Monitor
  • CVE-2026-343080 days apartVulnerability in the MySQL Server product of Oracle MySQL (component: Server: JSON).
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records