CVE-2026-27965: Vitess.io/vitess Vitess Users With Backup Storage Vulnerability
HIGHCVE-2026-27965 is a HIGH vitess users with backup storage vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Vitess.io/vitess libraries in the Go ecosystem. The issue involves vitess users with backup storage access can gain unauthorized access to production deployment environments. Remediation is available in the latest vendor maintenance releases.
CVE-2026-27965 at a Glance
How to Fix CVE-2026-27965
To remediate this vulnerability, upgrade all affected Vitess.io/vitess dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade vitess.io/vitess to Latest secure releaseRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for vitess.io/vitessHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-27965, inspect your project dependencies for Vitess.io/vitess:
inspect dependencies for vitess.io/vitessAnalyze the terminal output to locate any version of Vitess.io/vitess in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Vitess.io/vitess, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-27965 Affected Vitess.io/vitess Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
vitess.io/vitess
|
Go |
≤ 0.23.2
|
|
References
Frequently Asked Questions
What is CVE-2026-27965?
Which Vitess.io/vitess versions are affected?
What version fixes CVE-2026-27965?
Is vitess.io/vitess affected?
What CWE is associated with CVE-2026-27965?
How can I check Go dependencies for CVE-2026-27965?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-8g8j-r87h-p36x",
"modified" : "2026-02-26T22:50:37Z",
"published" : "2026-02-26T22:50:37Z",
"aliases" : [ "CVE-2026-27965" ],
"summary" : "Vitess users with backup storage access can gain unauthorized access to production deployment environments",
"details" : "### Impact\n\nAny user 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.\n\n### Patches\nFixes are expected to be released with versions v23.0.3 and v22.0.4\nSee fix commit at https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c\n\n### Workarounds\n\nIf maintainers *intended* to use an external decompressor then they 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.\n\nIf maintainers did *not intend* to use an external decompressor, nor an internal one, then they 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. \n\n### References\n\nUsers can read more about the issue here: https://github.com/vitessio/vitess/issues/19459",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "vitess.io/vitess"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "0.23.2"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/vitessio/vitess/security/advisories/GHSA-8g8j-r87h-p36x"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27965"
}, {
"type" : "WEB",
"url" : "https://github.com/vitessio/vitess/issues/19459"
}, {
"type" : "WEB",
"url" : "https://github.com/vitessio/vitess/pull/19460"
}, {
"type" : "WEB",
"url" : "https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/vitessio/vitess"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-78" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-02-26T22:50:37Z",
"nvd_published_at" : "2026-02-26T02:16:23Z"
}
}