Event Monitor Cyber
EM-20261103-4BGU VulnerabilityHigh severity

Argo CD Image Updater Vulnerability (CVE-2026-121621)

CVE-2026-121621

Status
Developing

Since : signals keep joining.

First Signal
Nov 02 18:00 UTCC41 Red Hat Security Data
Page Born
Nov 03 21:17 UTCsecond source joined
Last Signal
Nov 03 21:17 UTC20 hours before snapshot
Sources
21 official · 1 research, news or crowd
Open For
45 hoursso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing · Now
    New signals join; severity can move.
  3. 3
    Confirmed
    Not yet
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The address and ID never change. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    Nov 03 21:17 UTC
    C6 NVD published
  2. Scored: reached
    Nov 03 21:17 UTC
    CVSS 8.8 · EPSS 1.8%
  3. Exploited: not yet
    Not yet
    No exploitation reported
  4. Advisories: not yet
    Not yet
    None yet
  5. Vendor Response: reached
    Nov 02 18:00 UTC
    C41 published
  6. Resolved: not yet
    Not yet
    After 14 quiet days

Timeline

12:0018:00Nov 306:0012:0018:00Nov 406:00BornC41 Red Hat Security DataC6 NVD CVE API 2.0

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. CVE-2026-121621 (CVSS 8.8) (opens source in a new tab) 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 … High severityDatabaseC6 NVD CVE API 2.0
  2. Red Hat: CVE-2026-121621 (moderate) (opens source in a new tab) github.com/argoproj-labs/argocd-image-updater: argocd-image-updater: Arbitrary command execution via crafted SSH repository proxy configuration Med severityVendorC41 Red Hat Security Data