Github.com/argoproj-labs/argocd-image-updater: argocd-image-updater: arbitrary command execution via crafted ssh repository proxy…
Affects Argo CD Image Updater when it clones or fetches Git repositories over SSH through a configured proxy, as shipped in Red Hat OpenShift GitOps. CVSS rates it 8.8 (high). No fixed version is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. SSH Git repository with a proxy configured Proxy hostname contains shell metacharacters that are passed into GIT_SSH_COMMAND
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach10/20Shipped in major Linux distributions
- Severity8.8/10CVSS 8.8
- No patch5/5No patch listed yet
What would change the score
- Would score about 82 if added to CISA KEV
- Would score about 77 if CISA's SSVC rates exploitation active
- Would score about 39 if CISA's SSVC rates it automatable
CVE-2026-121621 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects Red Hat OpenShift GitOps; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 32/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Argo CD Image Updater, a tool that automatically updates container images in Argo CD deployments, is affected when it uses an SSH Git repository configured with a proxy setting. An attacker who can set a malicious proxy value could run arbitrary commands and access credentials within the Image Updater process.
Read the original 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.
What to do
Check whether your setup matches what the bug needs.
SSH Git repository with a proxy configured Proxy hostname contains shell metacharacters that are passed into GIT_SSH_COMMANDWorkaround: The checked facts give no workaround. Limiting the affected feature means not configuring a proxy for SSH-based Git repositories, since the bug requires that setup.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- openshift-gitops-1/argocd-image-updater-rhel9
Version range not reported
- openshift-gitops-1/gitops-rhel9-operator
Version range not reported
Evidence 3
- Report
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-121621
Is CVE-2026-121621 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A proxy URL whose hostname contains shell metacharacters can break out of the command passed into GIT_SSH_COMMAND. This lets commands run in the context of the Image Updater process, which can also reach other Git, Helm, and OCI credentials it holds.Source: bugzilla.redhat.com
Am I affected, and how do I check?
The checked facts do not list affected version ranges. The affected setup is an SSH Git repository with a proxy configured, and the risk depends on the proxy hostname containing shell metacharacters. Check the proxy settings of your SSH-based Git repository configuration and the Image Updater version in use against the advisory.Source: bugzilla.redhat.com
How do I fix CVE-2026-121621?
The checked facts name no fixed version, so no upgrade target can be given from them. Check the advisory and vendor channels for a fixed release and update when one is published.Source: bugzilla.redhat.com
What if there's no patch?
The checked facts give no workaround. Limiting the affected feature means not configuring a proxy for SSH-based Git repositories, since the bug requires that setup.Source: bugzilla.redhat.com