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Unauthenticated DoS in Oracle MySQL Server and MySQL Cluster Connection Handling

IdentifiersCVE-2026-46863CWE-400

CVE-2026-46863 is an easily exploitable denial-of-service vulnerability in Oracle MySQL Server and MySQL Cluster, specifically in the Server: Connection Handling component. Affected versions are MySQL Server 8.4.0 through 8.4.9 and 9.0.0 through 9.7.0, and MySQL Cluster 8.0.11 through 8.0.46, 8.4.0 through 8.4.9, and 9.0.0 through 9.7.0. According to Oracle, an unauthenticated attacker with network access via multiple protocols can exploit the flaw to compromise availability. The published details indicate the issue is reachable through connection-handling logic, but no more specific vulnerable function or code path is provided in the available content.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to cause MySQL Server or MySQL Cluster to hang or to crash in a frequently repeatable manner, resulting in complete denial of service. The stated impact is limited to availability; the provided CVSS vector indicates no confidentiality or integrity impact (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base score 7.5).

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by restricting or blocking network access and protocols required to reach MySQL connection-handling interfaces, especially from untrusted networks. Limit access to only necessary clients and users, and remove unnecessary privileges or access paths where feasible. Oracle notes such workarounds may affect application functionality and are not a substitute for patching.

Remediation

Patch, then assume compromise.

Apply Oracle's June 2026 Critical Security Patch Update for the affected MySQL Server and MySQL Cluster releases. Where possible, upgrade to vendor-fixed supported versions that include the correction for CVE-2026-46863. Oracle also recommends remaining on actively supported versions so security patches are available.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
OracleMysql Clusterapplication
OracleMysql Serverapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

2 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-46863
NVD
nvd.nist.gov/vuln/detail/CVE-2026-46863
MITRE CWE · CWE-400
cwe.mitre.org