CVE-2026-85518 Red Hat CVE debrief

Who should care

Defenders responsible for OpenSCAP configurations, Linux system administrators, and users handling SDS files should assess exposure and prioritize verification and remediation efforts.

Why it matters

CVE-2026-85518 is a path traversal vulnerability in OpenSCAP that allows unauthorized file creation or modification. Defenders should verify configurations, educate users, and monitor file system activities to mitigate potential impacts.

• Potential unauthorized file creation or modification
• Required user interaction for exploitation
• Need for verifying OpenSCAP configurations and user education

Technical summary

The OpenSCAP application does not properly validate relative file path attributes when decomposing a Source DataStream (SDS) file, leading to a path traversal vulnerability. This allows an attacker to create or modify files outside the intended target directory by tricking a user or automated system into decomposing a crafted datastream. Successful exploitation requires user interaction and can result in unauthorized file creation or modification with the permissions of the executing process. Defenders should prioritize verifying OpenSCAP configurations, ensuring user education on handling SDS files, and monitoring for suspicious file system activities.

Defensive priority

Defenders should prioritize verifying OpenSCAP configurations, ensuring user education on handling SDS files, and monitoring for suspicious file system activities.

Recommended defensive actions

• Verify OpenSCAP configurations and user permissions
• Educate users on safe handling of SDS files
• Monitor file system activities for suspicious behavior
• Apply patches or updates provided by Red Hat
• Review compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Check relevant monitoring, detection, and logs for exposed assets

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Red Hat offers advisories and errata related to this issue. OpenSCAP's source code and configuration files may be affected. Defenders should verify OpenSCAP configurations, review vendor advisories, and monitor for suspicious file system activities to mitigate potential impacts. The vulnerability's source details are limited, and defenders should exercise caution when handling SDS files.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.