{"id":"EM-20261103-4BGU","url":"https://cyber.eventmonitor.net/incident/EM-20261103-4BGU/","type":"cve","title":"Argo CD Image Updater Vulnerability (CVE-2026-121621)","subtitle":"CVE-2026-121621","subject":"CVE-2026-121621","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-03T21:17:37.857Z","firstSignal":"2026-11-02T18:00:00.000Z","lastSignal":"2026-11-03T21:17:37.857Z","updated":"2026-11-04T14:43:58.877Z","revision":1,"life":[{"status":"Born","at":"2026-11-03T21:17:37.857Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-03T21:17:37.857Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-02T18:00:00.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-03T21:17:37.857Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261103-4BGU created."},{"at":"2026-11-03T21:17:37.857Z","what":"Severity raised to High by C6"}],"stages":[{"name":"Disclosed","at":"2026-11-03T21:17:37.857Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-03T21:17:37.857Z","detail":"CVSS 8.8 · EPSS 1.8%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-02T18:00:00.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-02T18:00:00.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":2,"title":"Red Hat: CVE-2026-121621 (moderate)","text":"github.com/argoproj-labs/argocd-image-updater: argocd-image-updater: Arbitrary command execution via crafted SSH repository proxy configuration","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-121621.json"},{"at":"2026-11-03T21:17:37.857Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-121621 (CVSS 8.8)","text":"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.","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121621"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-03T21:17:37.857","score":8.8,"severity":"HIGH","desc":"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 ac","product":"","seen":1793803438877},"kev":null,"epss":{"epss":0.01762,"pct":0.78088,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}