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MySQL Server EUVDEUVD-2026-106180

| CVE-2026-101779 LOW
Improper Access Control (CWE-284)
2026-10-20 secalert_us@oracle.com GHSA-m88p-7h5x-mwf5
2.7
CVSS 3.1 · Vendor: oracle
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate with high privileges
  2. Exploit
    Connect via supported protocol
  3. Execution
    Abuse Server: Telemetry component
  4. Impact
    Trigger partial availability disruption

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an attacker to already hold HIGH database privileges on the target (PR:H), reached over the network via one of MySQL's supported protocols (AV:N), with no user interaction. The specific prerequisite is privileged access that can reach the 'Server: Telemetry' component; there is no evidence the flaw is reachable by unauthenticated or low-privileged users. The limiting factors are substantial: the high-privilege requirement confines realistic exploitation to insiders or attackers who have already compromised a privileged account, and the maximum impact is only a PARTIAL denial of service with no data exposure or modification. Affected versions are MySQL Server/Cluster 8.4.0-8.4.12, 9.7.0-9.7.3, and 26.7.0-26.7.1.

Impact

This is a low-severity, low-real-world-priority issue despite affecting a ubiquitous product. The CVSS 3.1 base score is only 2.7 with vector AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L - network vector and low complexity are offset by the requirement for HIGH privileges (PR:H) and the impact being limited to a PARTIAL availability loss (A:L) with no confidentiality or integrity impact. No EPSS score was provided in the input, and the issue is NOT listed in CISA KEV; no public exploit (POC) is referenced. No SSVC decision data was supplied. The dominant limiting signal is PR:H: an attacker must already hold high database privileges, which drastically narrows the realistic threat to insiders or already-compromised privileged accounts rather than opportunistic remote attackers. The only elevating factor is the ubiquity of MySQL, but even so the achievable outcome (partial DoS) is minor. Oracle's own phrasing calls it 'easily exploitable' yet still scores it 2.7, consistent with the high-privilege prerequisite capping overall risk. No signals are in conflict here - every available indicator points to low priority.

Exploit ScenarioDerived

An attacker who already possesses high-privilege credentials on a MySQL Server or MySQL Cluster instance connects over the network via one of the supported protocols and abuses the Server: Telemetry component to trigger a partial denial of service, degrading or interrupting availability of the database service. No public exploit code is referenced, and no confidentiality or integrity compromise is achievable. The attack is network-reachable but gated entirely by the need for pre-existing high privileges.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 21, 2026

Partial denial of service in MySQL Server and MySQL Cluster can be triggered by a high-privileged, authenticated attacker with network access through MySQL protocols against the Server: Telemetry component. The affected releases are MySQL Server and MySQL Cluster 8.4.0-8.4.12, 9.7.0-9.7.3, and 26.7.0-26.7.1. CVSS 3.1 scores the issue 2.7 with only low availability impact, and no public exploit was identified at time of analysis.

RemediationAI

Apply the MySQL Server and MySQL Cluster fix referenced in Oracle's October 2026 Critical Patch Update (https://www.oracle.com/security-alerts/cpuoct2026.html); the supplied data does not provide an exact fixed build number, so confirm the corrected 8.4.x, 9.7.x, or 26.7.x release in that advisory before upgrading. Until patched, restrict network reachability to trusted database clients and administrative networks, since the vector is AV:N; this reduces exposure but can break application or remote-administration connectivity. Enforce least privilege and review accounts that can access telemetry or administrative surfaces, because PR:H means only highly privileged users can trigger the issue; this limits insider and compromised-account paths but may require changes to operational workflows. Monitor for abnormal telemetry-related restarts or availability degradation, and verify vendor patch status rather than assuming a fixed version.

Affected VersionsENISA

MySQL Server 9.7.0-9.7.3
MySQL Cluster 8.4.0-8.4.12
MySQL Server 8.4.0-8.4.12
MySQL Cluster 26.7.0-26.7.1
MySQL Cluster 9.7.0-9.7.3
MySQL Server 26.7.0-26.7.1

Affected Packages

euvd mysql_cluster no fix
euvd mysql_server no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The named vulnerable component is Oracle MySQL's 'Server: Telemetry' subsystem, which handles monitoring, diagnostics, or metric-related server functionality. No CWE mapping or CPE identifiers were included in the supplied intelligence, so the precise root-cause class cannot be confirmed without the vendor advisory. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L shows network reachability with low attack complexity, but requires high database privileges and no user interaction; the only scored impact is low availability, with no confidentiality or integrity effect. That means the flaw is not an unauthenticated remote denial-of-service condition in the assessed vector; the practical security boundary is the need for an already privileged account that can reach the telemetry surface. MySQL Cluster mirrors the same affected version ranges.

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Severity by source

Vendor (oracle) PRIMARY 2.7 LOW
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
vuln.today AI 2.7 LOW

Network-reachable (AV:N) and low complexity (AC:L), but requires high database privileges (PR:H) and yields only partial availability loss (A:L) with no C/I impact.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

DescriptionCVE.org

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Telemetry). Supported versions that are affected are MySQL Server: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 8.4.0-8.4.12, 9.7.0-9.7.3 and 26.7.0-26.7.1. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 2.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L).

Threat Intelligence Overview

EPSS Score
0.3%
Top 81% exploitable
Prevalence
Ubiquitous
MySQL Server/Cluster is among the most widely deployed databases globally
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity LOW
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Low

Priority Score

14
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +14
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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