CVE-2026-58138 — conductor
Fix: conductor-oss/conductor@87a7d96CVE-2026-58138 is a Code Injection vulnerability. 2 public exploit references exist, so weaponization risk is real. A fix is available — see the affected versions and patch details below.
Orkes Conductor 3.21.21 < 3.30.2 Unauthenticated RCE via GraalVM Script Evaluators
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-58138.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
Description
Orkes Conductor 3.21.21 before 3.30.2 contains an unauthenticated remote code execution vulnerability that allows remote attackers to execute arbitrary OS commands by submitting inline workflow definitions containing malicious JavaScript or Python expressions to the workflow API endpoint prior to authentication. Attackers can exploit unsandboxed GraalVM evaluators configured with HostAccess.ALL or allowAllAccess(true) through INLINE, LAMBDA, DO_WHILE, and SWITCH task types to invoke arbitrary system commands via Java reflection or direct subprocess calls.
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
OrkesConductor 3.30.2 - Unauthenticated Remote Code Execution
by banyamer · Aug 10, 2026
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2026-58138, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
How to detect CVE-2026-58138
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2026-58138 -u https://target- Template
- Orkes Conductor 3.21.21-3.30.1 - Remote Code Execution
- Severity
- critical
- Impact
- A remote, unauthenticated attacker can execute arbitrary operating system commands on the Conductor server.
- Remediation
- Upgrade to Orkes Conductor 3.30.2 or later, which disables host class loading in the script evaluators.
Template by ProjectDiscovery nuclei-templates (aryu-ru), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2026-58138 in your dependencies?
Find it across , including transitive dependencies.