AWS OpenJD Sessions/Deadline Cloud Worker Agent Cross-User Process Launcher PATH untrusted search path

Summaryinfo

A vulnerability, which was classified as critical, has been found in AWS OpenJD Sessions and Deadline Cloud Worker Agent. Impacted is an unknown function of the component Cross-User Process Launcher. This manipulation of the argument PATH causes untrusted search path. This vulnerability is tracked as CVE-2026-126087. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in AWS OpenJD Sessions and Deadline Cloud Worker Agent (affected version unknown). Affected by this vulnerability is an unknown functionality of the component Cross-User Process Launcher. The manipulation of the argument PATH with an unknown input leads to a untrusted search path vulnerability. The CWE definition for the vulnerability is CWE-426. The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Untrusted search path in the cross-user process launcher in Open Job Description (OpenJD) Sessions for Python before 0.11.0, as used in the AWS Deadline Cloud worker agent before 0.33.0, on Linux might allow an authenticated remote user with permission to submit jobs to a queue to execute arbitrary code as the worker agent OS user and obtain the AWS credentials held by the worker agent via a crafted job that modifies the PATH environment variable. To remediate this issue, users of customer-managed fleets should upgrade the Deadline Cloud worker agent to version 0.33.0 or later, which includes OpenJD Sessions 0.11.0. Service-managed fleets were remediated service-side.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-126087 since 11/10/2026. The exploitation appears to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/10/2026). MITRE ATT&CK project uses the attack technique T1574 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Cloud Software

Vendor

• AWS

Name

• Deadline Cloud Worker Agent
• OpenJD Sessions

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