GHSA-VJMH-7F4C-CX88
Vulnerability from github – Published: 2026-08-04 21:30 – Updated: 2026-08-05 21:31Google::Auth versions before 0.06 for Perl run a command named in an external_account credentials JSON via an ungated system call.
The Pluggable subclass reads credential_source.executable.command from the credentials JSON and runs it as system($command), a single argument call that passes the whole string to /bin/sh -c. The executable's environment_variables map from the same JSON is copied into %ENV first. No opt-in gate guards the call. make_creds selects the Pluggable subclass whenever credential_source.executable is present, so the path is reached from the standard Application Default Credentials flow, including a "type": "external_account" configuration read from the file named by GOOGLE_APPLICATION_CREDENTIALS. Configurations without credential_source.executable do not select this subclass and do not reach the call.
Any caller that builds credentials from a configuration it does not fully control runs the embedded command with the privileges of the application process.
{
"affected": [],
"aliases": [
"CVE-2026-66902"
],
"database_specific": {
"cwe_ids": [
"CWE-78"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-04T21:16:37Z",
"severity": "CRITICAL"
},
"details": "Google::Auth versions before 0.06 for Perl run a command named in an external_account credentials JSON via an ungated system call.\n\nThe Pluggable subclass reads credential_source.executable.command from the credentials JSON and runs it as `system($command)`, a single argument call that passes the whole string to /bin/sh -c. The executable\u0027s environment_variables map from the same JSON is copied into %ENV first. No opt-in gate guards the call. make_creds selects the Pluggable subclass whenever credential_source.executable is present, so the path is reached from the standard Application Default Credentials flow, including a \"type\": \"external_account\" configuration read from the file named by GOOGLE_APPLICATION_CREDENTIALS. Configurations without credential_source.executable do not select this subclass and do not reach the call.\n\nAny caller that builds credentials from a configuration it does not fully control runs the embedded command with the privileges of the application process.",
"id": "GHSA-vjmh-7f4c-cx88",
"modified": "2026-08-05T21:31:35Z",
"published": "2026-08-04T21:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66902"
},
{
"type": "WEB",
"url": "https://github.com/GoogleCloudPlatform/google-auth-library-perl/commit/c95c77e70bec94f17e239d88050f843ea1cade95.patch"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/CJCOLLIER/Google-Auth-0.06/diff/CJCOLLIER/Google-Auth-0.05"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/08/04/35"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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