CVE-2026-27965 Vitess users with backup storage access can gain unauthorized access to production deployment environments
Attackers with backup storage access can inject commands into manifest files to execute arbitrary code and gain unauthorized access to production environments.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-27965?
CVE-2026-27965 is a high-severity command injection vulnerability in vitessio vitess, published on 26 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-27965?
3 open source packages ship an affected version, including vitess.io/vitess. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vitess.io/vitess Go | All versions | 0.22.4, 0.23.3 |
vitess.io/vitess Go | All versions to 0.23.2 | None |
vitess.io/vitess Go | All versions to 0.23.2 | None |
Products include Linuxfoundation Vitess.
How do I fix CVE-2026-27965?
Upgrade vitess.io/vitess to a fixed version for your release line: 0.22.4 or 0.23.3.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-27965 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27965 exists.
Other vulnerabilities in vitessio vitess
- CVE-2026-104252 Vitess vttablet /twopcz reflected XSS
- CVE-2026-27969 Vitess users with backup storage access can write to arbitrary file paths on restore
- CVE-2023-29195 Vitess VTAdmin users that can create shards can deny access to other functions
- CVE-2023-29194 vitess allows users to create keyspaces that can deny access to already existing keyspaces
Sources
Also known as AZL-78356, AZL-78593, GHSA-8g8j-r87h-p36x, GO-2026-4567.