high CVSS 7.5 EPSS 0.45%

CVE-2026-46862·MySQL vulnerability

Vulnerability in the MySQL Router product of Oracle MySQL (component: Router: General). Supported versions that are affected are 8.4.0-8.4.9 and 9.0.0-9.7.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TLS to compromise MySQL Router. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Router. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Severity
high
Software
MySQL
Fixed in
8.0.46-0ubuntu0.20.04.1+esm3
Published

How likely is exploitation

FIRST's Exploit Prediction Scoring System puts the probability of this CVE being exploited in the next 30 days at 0.45% — higher than 36% of all published CVEs. EPSS is an independent forecast of exploitation, not a severity rating: it says nothing about how much damage a successful attack does, which is what a CVSS score measures.

Read the two together. CVE-2026-46862 scores 7.5 on CVSS, so a successful attack would be serious — but at 0.45%, almost nobody is currently attempting it. That is a different situation from a flaw under mass exploitation, and it is usually the difference between patching on your next maintenance window and patching tonight.

Affected versions

From: 9.0.0

Until: 9.7.0

Fixed in: 8.0.46-0ubuntu0.20.04.1+esm3

How to fix this CVE

MySQL Router versions 9.0.0 through 9.7.0 contain a denial-of-service vulnerability accessible over TLS without authentication. Upgrade to MySQL Router 9.8.0 or later, or apply the security patch from Oracle's June 2026 CPU advisory immediately. Ensure all MySQL Router instances in your environment are updated and restarted to mitigate the risk of service disruption.

sudo dnf update mysql-server

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

TLS handshake followed by abnormal connection close or protocol violation; watch for patterns like: 'Connection reset by peer', 'TLS alert', or 'unexpected EOF' in MySQL Router logs immediately preceding a service crash or hang event

How to check if you are affected

  1. Step 1: Check MySQL Router version with: mysql-router --version or /usr/bin/mysql-router --version
  2. Step 2: Verify if MySQL Router is exposed to the network by running: netstat -tlnp | grep mysql-router or ss -tlnp | grep mysql-router
  3. Step 3: Review MySQL Router logs for unexpected connection terminations or crashes: grep -i 'crash\|segfault\|hang' /var/log/mysql/router.log or /var/log/mysqlrouter/*.log
  4. Step 4: After patching, restart MySQL Router with: sudo systemctl restart mysqlrouter and confirm no errors appear in logs within 5 minutes

FAQ

What is CVE-2026-46862?

CVE-2026-46862 is a high-severity denial-of-service flaw in MySQL Router that allows unauthenticated attackers to crash or hang the Router service by sending specially crafted TLS connections, disrupting all routing services.

Is CVE-2026-46862 being actively exploited?

No, there is no evidence of active exploitation in the wild according to CISA's KEV catalog, and no public exploit code is currently available.

What versions of MySQL are affected by CVE-2026-46862?

MySQL Router versions 9.0.0 through 9.7.0 are affected; earlier versions like 8.4.0–8.4.9 are also vulnerable. The fix is available in MySQL Router 9.8.0 and later.

How do I check if my server is vulnerable to CVE-2026-46862?

Run mysql-router --version and compare the output against the affected range (9.0.0–9.7.0). If your version falls within this range, your system is vulnerable.

Does Defensia detect CVE-2026-46862?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If MySQL Router is installed on a monitored server, CVE-2026-46862 will appear in your dashboard with remediation steps.

Related MySQL CVEs

CVE-2026-29080CVSS 8.8A SQL injection vulnerability in `FilterEngine.create_sqla_query()` allows any authenticated Rucio user to execute arbitrary SQL against the backend database through the DID search endpoint (`GET /dids/<scope>/dids/search`). On Oracle deployments attacker-controlled filter keys and values are interpolated directly into `sqlalchemy.text()` via Python `.format()`, completely bypassing parameterization. This enables full database compromise including extraction of authentication tokens, password hashes, and all managed data identifiers. This affects versions 1.27.0 and later before 35.8.5, 38.5.5, 39.4.2, and 40.1.1. The vulnerability exists in `lib/rucio/core/did_meta_plugins/filter_engine.py` within the `create_sqla_query()` method. When the database dialect is Oracle, filter expressions for JSON metadata columns are constructed using `text()` with Python string formatting. Both `key` and `value` are attacker-controlled strings derived from HTTP query parameters. The `text()` function creates a raw SQL fragment — it does **not** escape or parameterize its contents. Any authenticated Rucio user can exploit this through the DID search API to execute arbitrary SQL against the backend database. This can expose all managed data identifiers and sensitive tables such as identities, tokens, accounts, rse_settings, and rules, and may allow modification of database contents. The issue affects Oracle deployments using the default json_meta plugin and does not affect PostgreSQL or MySQL deployments using that plugin. This vulnerability has been fixed in versions 35.8.5, 38.5.5, 39.4.2, and 40.1.1.
CVE-2026-60163CVSS 8.4Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Group Replication Plugin). 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 unauthenticated attacker with logon to the infrastructure where MySQL Server, MySQL Cluster executes to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in takeover of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 8.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
CVE-2026-60315CVSS 8.2Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: X Plugin). 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 unauthenticated 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 and unauthorized read access to a subset of MySQL Server, MySQL Cluster accessible data. CVSS 3.1 Base Score 8.2 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H).
CVE-2026-46863CVSS 7.5Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Connection Handling). Supported versions that are affected are MySQL Server: 8.4.0-8.4.9, 9.0.0-9.7.0; MySQL Cluster: 8.0.11-8.0.46, 8.4.0-8.4.9 and 9.0.0-9.7.0. Easily exploitable vulnerability allows unauthenticated 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
CVE-2026-60316CVSS 7.2Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: X Plugin). 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 takeover of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 7.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

References

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