RHSA-2026:98536: Important: flatpak-builder security update

Q: What attacker-controlled input is required to exploit this issue?

Exploitation requires a patch source processed through flatpak-builder's use-git-am extraction path. The issue involves Git hook execution during git am processing.

Q: What is the potential impact if exploitation succeeds?

Successful exploitation can result in code execution on the host running flatpak-builder.

Q: Which packages are covered by this security update?

The update covers redhat/flatpak-builder, redhat/flatpak-builder-debuginfo, and redhat/flatpak-builder-debugsource.

Published Nov 11, 2026

Updated

Flatpak-builder is a tool for building flatpaks from sources.Security Fix(es): flatpak-builder: Host code execution via git am hook execution in patch source extraction (use-git-am) (CVE-2026-86320) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected Software

12 affected componentsFixes available

redhat/flatpak-builder<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debuginfo<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debugsource<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debuginfo<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debugsource<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debuginfo<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder-debugsource<1.2.3-1.el9_9.1

1.2.3-1.el9_9.1

redhat/flatpak-builder<1.2.3-1.el9_9.1.aa

1.2.3-1.el9_9.1.aa

redhat/flatpak-builder-debuginfo<1.2.3-1.el9_9.1.aa

1.2.3-1.el9_9.1.aa

redhat/flatpak-builder-debugsource<1.2.3-1.el9_9.1.aa

1.2.3-1.el9_9.1.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade redhat/flatpak-builder to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1
Upgrade
Upgrade redhat/flatpak-builder-debuginfo to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1
Upgrade
Upgrade redhat/flatpak-builder-debugsource to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1
Upgrade
Upgrade redhat/flatpak-builder to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1.aa
Upgrade
Upgrade redhat/flatpak-builder-debuginfo to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1.aa
Upgrade
Upgrade redhat/flatpak-builder-debugsource to a version that resolves this vulnerability.
Fixed in 1.2.3-1.el9_9.1.aa

Event History

Nov 11, 2026

Advisory Published

via Red Hat·12:00 AM

Data Sourced

via Red Hat·12:00 AM

RemedyDescriptionAffected Software

Frequently Asked Questions

What attacker-controlled input is required to exploit this issue?

Exploitation requires a patch source processed through flatpak-builder's use-git-am extraction path. The issue involves Git hook execution during git am processing.

What is the potential impact if exploitation succeeds?

Successful exploitation can result in code execution on the host running flatpak-builder.

Which packages are covered by this security update?

The update covers redhat/flatpak-builder, redhat/flatpak-builder-debuginfo, and redhat/flatpak-builder-debugsource.

RHSA-2026:98536: Important: flatpak-builder security update

Affected Software

Remediation

Event History

Frequently Asked Questions

What attacker-controlled input is required to exploit this issue?

What is the potential impact if exploitation succeeds?

Which packages are covered by this security update?

Company

Resources

Contact

Frequently Asked Questions

What attacker-controlled input is required to exploit this issue?

What is the potential impact if exploitation succeeds?

Which packages are covered by this security update?