RCE in Conductor-Oss Conductor
CVE-2026-58138
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.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.012 (63.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Conductor-oss Conductor — versions 3.21.21
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-58138?
- CVE-2026-58138 is a critical-severity vulnerability in Conductor-Oss Conductor, classified under Code Injection. CVSS score: 9.8/10. Published 2026-06-30.
- How severe is CVE-2026-58138?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-58138 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.