CVE-2026-27965
Vitess users with backup storage access can gain unauthorized access to production deployment environments
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.
INFO
Published Date :
Feb. 26, 2026, 2:16 a.m.
Last Modified :
March 2, 2026, 6:36 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Vitess to versions 23.0.3 or 22.0.4.
- Configure `--external-decompressor` flag for vttablet.
- Configure `--external-decompressor` flag for vtbackup.
- Specify 'cat' or 'tee' as decompressor if not using one.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27965.
| URL | Resource |
|---|---|
| https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c | Patch |
| https://github.com/vitessio/vitess/issues/19459 | Issue Tracking |
| https://github.com/vitessio/vitess/pull/19460 | Issue Tracking Patch |
| https://github.com/vitessio/vitess/security/advisories/GHSA-8g8j-r87h-p36x | Mitigation Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27965 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27965
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27965 vulnerability anywhere in the article.
-
Daily CyberSecurity
Critical Backup Flaws Expose Vitess Environments to Complete Takeover
Vitess is a cloud-native horizontally-scalable distributed database system that is built around MySQL. It allows organizations to achieve unlimited scaling through generalized sharding, and operators ... Read more
The following table lists the changes that have been made to the
CVE-2026-27965 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:vitess:*:*:*:*:*:*:*:* versions up to (excluding) 22.0.4 *cpe:2.3:a:linuxfoundation:vitess:*:*:*:*:*:*:*:* versions from (including) 23.0.0 up to (excluding) 23.0.3 Added Reference Type GitHub, Inc.: https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/vitessio/vitess/issues/19459 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/vitessio/vitess/pull/19460 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/vitessio/vitess/security/advisories/GHSA-8g8j-r87h-p36x Types: Mitigation, Patch, Vendor Advisory -
New CVE Received by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-78 Added Reference https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c Added Reference https://github.com/vitessio/vitess/issues/19459 Added Reference https://github.com/vitessio/vitess/pull/19460 Added Reference https://github.com/vitessio/vitess/security/advisories/GHSA-8g8j-r87h-p36x