Vulnerability Description
Vitess is a database clustering system for horizontal scaling of MySQL. Prior to versions 23.0.3 and 22.0.4, anyone with read/write access to the backup storage location (e.g. an S3 bucket) can manipulate backup manifest files so that arbitrary code is later executed when that backup is restored. This can be used to provide that attacker with unintended/unauthorized access to the production deployment environment — allowing them to access information available in that environment as well as run any additional arbitrary commands there. Versions 23.0.3 and 22.0.4 contain a patch. Some workarounds are available. Those who intended to use an external decompressor then can always specify that decompressor command in the `--external-decompressor` flag value for `vttablet` and `vtbackup`. That then overrides any value specified in the manifest file. Those who did not intend to use an external decompressor, nor an internal one, can specify a value such as `cat` or `tee` in the `--external-decompressor` flag value for `vttablet` and `vtbackup` to ensure that a harmless command is always used.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Vitess | < 22.0.4 |
Related Weaknesses (CWE)
References
- https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdbPatch
- https://github.com/vitessio/vitess/issues/19459Issue Tracking
- https://github.com/vitessio/vitess/pull/19460Issue TrackingPatch
- https://github.com/vitessio/vitess/security/advisories/GHSA-8g8j-r87h-p36xMitigationPatchVendor Advisory
FAQ
What is CVE-2026-27965?
CVE-2026-27965 is a vulnerability with a CVSS score of 9.9 (CRITICAL). Vitess is a database clustering system for horizontal scaling of MySQL. Prior to versions 23.0.3 and 22.0.4, anyone with read/write access to the backup storage location (e.g. an S3 bucket) can manipu...
How severe is CVE-2026-27965?
CVE-2026-27965 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-27965?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Vitess.