CVE-2026-21929

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Parser). Supported versions that are affected are 9.0.0-9.5.0. Difficult to exploit 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H).

Published: 2026-01-20 Last update: 2026-01-29 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-21929 is rated Low Risk (27/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-21929

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-29 0.04% 0.05% +0.01%
2 2026-01-21 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-21929

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 3.6 [email protected]

Weakness enumeration for CVE-2026-21929

OS Trackers for CVE-2026-21929

vendor priority summary link
debian unimportant CVE-2026-21929 unimportant priority: Debian including 1 source packages (mysql-8.0), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2026-21929
redhat medium — https://access.redhat.com/security/cve/CVE-2026-21929
suse medium — https://www.suse.com/security/cve/CVE-2026-21929/
ubuntu medium CVE-2026-21929 medium priority: Ubuntu including 11 source packages (mariadb, mariadb-10.0, …), 53 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): DNE 27, not-affected 16, needs-triage 6, ignored 4. https://ubuntu.com/security/CVE-2026-21929

Affected software / configurations for CVE-2026-21929

Vendor Product Version Raw CPE
oracle mysql_server >= 9.0.0, <= 9.5.0 cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*

References for CVE-2026-21929

cvelogic Threat Intelligence