CVE-2026-27969: Vitess users with backup storage access can write to arbitrary file paths on restore

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-26 · updated 2026-06-17
Weakness: CWE-22

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 files in the manifest — which may be files that they have also added to the manifest and backup contents — are written to any accessible location on restore. This is a common path traversal security issue. 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. No known workarounds are available.

Affected products

vitessio vitess: before 22.0.4; from 23.0.0 before 23.0.3 — fixed in 22.0.4, 23.0.3

How to fix

Upgrade to a fixed version: vitessio vitess 22.0.4, 23.0.3. Check the vendor advisory for mitigations.

References

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