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Response snapshot Oct 28, 2026, 20:06 UTC

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VulnerabilityGHSA-473q-m89c-ghf8

MySqlConnector: Account password disclosed to a man-in-the-middle in zero-configuration TLS mode (clear-text password sent before certificate is verified)

With SslMode set to VerifyCA or VerifyFull with no configured CA certificate, an unvalidated TLS connection is treated as secure and a clear-text password can be sent before the certificate is checked. This can occur when relying on the password to validate a self-signed cert, e.g.

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: MySqlConnector: 2.6.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-473q-m89c-ghf8 (opens a new tab)

What happened

Summary

With SslMode set to VerifyCA or VerifyFull with no configured CA certificate, an unvalidated TLS connection is treated as secure and a clear-text password can be sent before the certificate is checked. This can occur when relying on the password to validate a self-signed cert, e.g., MariaDB's [zero-configuration TLS](https://mariadb.com/docs/server/security/encryption/data-in-transit-encryption/zero-configuration-ssl).

Impact

An attacker who can deploy a man-in-the-middle MySQL proxy presenting any self-signed certificate can capture the plaintext database password of a client that:

Continue reading

- uses SslMode = VerifyCA or VerifyFull, and - does not use the SslCa connection string option, and - uses a non-empty password.

The attacker completes the TLS handshake with its own cert, requests a clear-text password authentication scheme (mysql_clear_password, or forces the caching_sha2_password/sha256_password clear-text fallback), and receives the password before the fingerprint check rejects the connection, defeating the man-in-the-middle protection VerifyFull is expected to provide.

Not affected: a configured CA (SslCa), CA-validated TLS, local connections (Unix socket / loopback), or empty passwords. Using SslMode set to Preferred or Required is out of scope (this is documented as not authenticating the server).

Workarounds

Provide SslCa with VerifyCA/VerifyFull, use a local/Unix-socket connection, or avoid clear-text authentication.

References

- https://mariadb.org/mission-impossible-zero-configuration-ssl/

Affected package ranges reported by GitHub: MySqlConnector: < 2.6.1

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-473q-m89c-ghf8 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-473q-m89c-ghf8, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). MySqlConnector: Account password disclosed to a man-in-the-middle in zero-configuration TLS mode (clear-text password sent before certificate is verified). https://kevwire.com/record/GHSA-473q-m89c-ghf8

MLA

"MySqlConnector: Account password disclosed to a man-in-the-middle in zero-configuration TLS mode (clear-text password sent before certificate is verified)." KEVWire, 28 Oct. 2026, kevwire.com/record/GHSA-473q-m89c-ghf8.

Chicago

KEVWire. "MySqlConnector: Account password disclosed to a man-in-the-middle in zero-configuration TLS mode (clear-text password sent before certificate is verified)." Last modified October 28, 2026. https://kevwire.com/record/GHSA-473q-m89c-ghf8.

Evidence summary (plain text)

MySqlConnector: Account password disclosed to a man-in-the-middle in zero-configuration TLS mode (clear-text password sent before certificate is verified) (Oct 28, 2026).
With SslMode set to VerifyCA or VerifyFull with no configured CA certificate, an unvalidated TLS connection is treated as secure and a clear-text password can be sent before the certificate is checked. This can occur when relying on the password to validate a self-signed cert, e.g., MariaDB's [zero-configuration TLS](https://mariadb.com/docs/server/security/encryption/data-in-transit-encryption/zero-configuration-ssl).
Sources:
GitHub-reviewed advisory GHSA-473q-m89c-ghf8: https://github.com/advisories/GHSA-473q-m89c-ghf8
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-473q-m89c-ghf8.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 19:50 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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