CVE-2026-58138 — conductor-oss conductor

What is 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.

The record classifies CVE-2026-58138 under weakness class CWE-94. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 133 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score: 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (FIRST): 14.6% probability of exploitation in the next 30 days, higher than 96.5% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-30

Is CVE-2026-58138 being exploited?

Weaponised exploit code for CVE-2026-58138 is publicly available. 7 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2026/CVE-2026-58138.yaml). It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.

0xBlackash/CVE-2026-58138 (github)
Ch4120N/CVE-2026-58138 (github)
BiiTts/CVE-2026-58138-Conductor-Unauth-RCE (github)
seqra/cve-2026-58138 (github)
0xgh057r3c0n/CVE-2026-58138 (github)
Procjevt/CVE-2026-58138 (github)
Ez4rd1x1/CVE-2026-58138-Research (github)

Affected products and versions

conductor-oss: conductor

How to fix CVE-2026-58138

Patch reference: https://github.com/conductor-oss/conductor/commit/87a7d96aabbb706d6e84f812b93da5165028d18f. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-58138

1 tracked threat in the Threadlinqs corpus references CVE-2026-58138, either in the campaign’s CVE list or as an indicator on the campaign record.

Critical Pre-Auth RCE in Orkes Conductor Workflow Platform (CVE-2026-58138) Exploited in the Wild — CRITICAL · 2026-09-19

Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei.