CVE-2026-78367 Red Hat CVE debrief

Who should care

System administrators and users of RPM's rpmbuild tarball processing, especially those in environments where automated build systems or victims may process attacker-controlled source tarballs, should assess their exposure and implement necessary mitigations. This includes reviewing system configurations, monitoring for suspicious activity, and applying vendor remediation when available. Security teams should prioritize patching and vulnerability management for affected systems, while also ensuring that compensating controls are in place for exposed systems during remediation efforts. Additionally, operators and platform administrators should verify that their current configurations and update processes are secure against this vulnerability, and track exceptions and retest remediated assets to ensure thorough resolution of the issue. Vulnerability management and security teams should also review and enhance their detection and response capabilities to address potential exploitation attempts related to this vulnerability. Asset inventory management should be updated to reflect affected systems and prioritize remediation based on operational impact and exposure levels. Finally, maintaining detailed records of remediation efforts and verification of successful patch application will be crucial for ensuring that the vulnerability is fully addressed across the organization. This requires coordination across IT operations, security, and development teams to ensure comprehensive mitigation and minimize potential disruptions to critical systems and services. Effective communication of risk and mitigation strategies to stakeholders is also essential for aligning security measures with business objectives and ensuring that all relevant parties are informed about the vulnerability and its resolution. By taking these steps, organizations can reduce their risk exposure and protect their systems from potential exploitation of this vulnerability in RPM's rpmbuild tarball processing functionality. The CVE record was published on 2026-08-24T14:17:04.767Z and has not been modified since then, indicating that immediate attention is required to address this high-severity issue. The

Technical summary

The getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the privileges of the user running rpmbuild. This vulnerability affects systems utilizing RPM's rpmbuild tarball processing.

Defensive priority

This vulnerability allows for arbitrary code execution with the privileges of the user running rpmbuild, indicating a high level of concern for systems utilizing RPM's rpmbuild tarball processing.

Recommended defensive actions

• Inventory and assess systems utilizing RPM's rpmbuild tarball processing for exposure.
• Apply vendor remediation when available.
• Implement compensating controls, such as restricting access to rpmbuild and monitoring for suspicious activity.
• Exception tracking and retest procedures should be established.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The vulnerability was found in RPM's rpmbuild tarball processing, specifically in the getTarSpec() function in tools/rpmbuild.cc. A crafted source archive can inject RPM macros, including Lua expressions, resulting in arbitrary code execution. This issue can be triggered when a victim or automated build system processes an attacker-controlled source tarball using rpmbuild tarball mode. Evidence is limited to public CVE details and NVD analysis.

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.