PT-2026-3699 · Oracle+1 · Mysql Server

Jingzhou Fu + 1 · Published 2026-01-20 · Updated 2026-01-21 · CVE-2026-21949

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Oracle MySQL versions 9.0.0 through 9.5.0

Description An issue exists in the MySQL Server component, specifically within the Optimizer. A low-privileged attacker with network access through multiple protocols can cause a denial-of-service condition, leading to a hang or frequent crashes of the MySQL Server.

Recommendations Update to a version beyond 9.5.0. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Resource Exhaustion

RCE

Weakness Enumeration

CWE-400

CWE-20

Related Identifiers

BDU:2026-00700

CVE-2026-21949

Affected Products

Mysql Server

References · 9

• https://bdu.fstec.ru/vul/2026-00700 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21949 · Vendor Advisory
• https://oracle.com/security-alerts/cpujan2026.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-21949 · Security Note
• https://ubuntu.com/security/CVE-2026-21949 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-21949 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21949 · Security Note
• https://cybersecurity-help.cz/vdb/SB20260120188 · Note
• https://twitter.com/CVEnew/status/2013783007627444361 · Twitter Post