Is CVE-2026-121621 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121621?

CVE-2026-121621 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-121621

Description

A command injection vulnerability was found in Argo CD Image Updater, where a proxy URL configured on an SSH Git repository is passed unsanitized into a shell-interpreted SSH command. An attacker able to set a malicious proxy value can inject shell metacharacters to execute arbitrary commands and access credentials in the context of the Image Updater process.