Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Network-reachable via multiple protocols but requires high-privilege database credentials (PR:H); impact is exclusively availability (A:H) with no confidentiality or integrity effect and no scope change.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
Lifecycle Timeline
2DescriptionCVE.org
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are MySQL Server: 8.4.0-8.4.10, 9.7.0-9.7.1; MySQL Cluster: 8.0.0-8.0.47, 8.4.0-8.4.10 and 9.7.0-9.7.1. 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 hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. 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).
AnalysisAI
MySQL Server and MySQL Cluster's Optimizer component can be crashed or hung by a high-privileged attacker with network access, resulting in complete denial of service. Affected deployments span MySQL Server 8.4.0-8.4.10 and 9.7.0-9.7.1, as well as MySQL Cluster 8.0.0-8.0.47, 8.4.0-8.4.10, and 9.7.0-9.7.1, per Oracle's July 2026 Critical Patch Update. No public exploit code has been identified and this vulnerability is not listed in the CISA KEV catalog, making real-world exploitation contingent on access to high-privileged database credentials.
Technical ContextAI
The vulnerable component is the MySQL Server Optimizer - the subsystem responsible for parsing, planning, and selecting efficient execution strategies for SQL queries. Flaws in optimizer logic commonly manifest as infinite loops, assertion failures, or unhandled edge cases when processing specially crafted or pathological query constructs, leading to server hangs or repeatable crashes. CPE identifiers cpe:2.3:a:oracle_corporation:mysql_server and cpe:2.3:a:oracle_corporation:mysql_cluster confirm that both the standard server and the NDB Cluster variant (which adds distributed storage and high-availability semantics) are affected. The CVSS vector AV:N reflects that MySQL's native protocol and administrative interfaces are network-exposed, while PR:H indicates exploitation requires a user with elevated database privileges. No CWE has been assigned by the reporter, which limits root-cause classification; however, the hang-or-crash impact pattern is consistent with CWE-835 (Loop with Unreachable Exit Condition) or CWE-617 (Reachable Assertion) in optimizer code paths.
RemediationAI
Apply the Oracle Critical Patch Update (CPU) for July 2026, available at https://www.oracle.com/security-alerts/cpujul2026.html. Patch available per vendor advisory; exact fixed version numbers for MySQL Server and MySQL Cluster should be confirmed directly from the Oracle advisory, as specific patched release identifiers are not independently confirmed in the available input data. As a compensating control where immediate patching is not feasible, restrict network access to MySQL ports (default 3306/TCP for MySQL Server; 1186/TCP for NDB Cluster management) to only trusted application hosts and administrative subnets using firewall rules - note this may require application connectivity adjustments. Additionally, audit and minimize the set of accounts holding high-privileged database roles (such as SUPER or SYSTEM_VARIABLES_ADMIN), since only high-privilege accounts can trigger this vulnerability; reducing the privileged account surface directly limits exploitability. Revoking unnecessary elevated grants has no functional impact on standard application database accounts.
More in Mysql Server
View allA heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4
XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.8), this vulnerabi
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. Rated critical severity (
When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer
XStream is a Java library to serialize objects to XML and back again. Rated critical severity (CVSS 9.1), this vulnerabi
A use of incorrectly resolved name vulnerability fixed in 7.83.1 might remove the wrong file when `--no-clobber` is used
curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when
libcurl-using applications can ask for a specific client certificate to be used in a transfer. Rated high severity (CVSS
A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FT
Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3. Rated critical severity (CVSS 9.8), this vul
A vulnerability was found in Hibernate-Validator. Rated medium severity (CVSS 6.1), this vulnerability is remotely explo
When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
View allVendor StatusVendor
SUSE
Severity: Moderate| Product | Status |
|---|---|
| SUSE Liberty Linux 10 | Fixed |
| SUSE Liberty Linux 8 | Fixed |
| SUSE Liberty Linux 9 | Fixed |
Share
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-46553
GHSA-r62r-4vf9-gc43