Arbitrary Code Execution Vulnerability in Flatpak-Builder by Red Hat
CVE-2026-86320

7.8HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Vendor
CVE Published:
17 September 2026

What is CVE-2026-86320?

A security flaw exists in Flatpak-Builder due to improper handling of Git hooks. When the 'use-git-am' option is enabled, malicious source code with a Git post-applypatch hook can lead to the execution of arbitrary code on the build host. This vulnerability allows an attacker to leverage the permissions of the user running Flatpak-Builder, potentially leading to unauthorized actions and data compromise.

Affected Version(s)

Red Hat Enterprise Linux 10 0:1.4.4-1.el10_2.1

Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.4.4-1.el10_0.1

Red Hat Enterprise Linux 8 0:1.2.3-2.el8_10

References

https://access.redhat.com/errata/RHSA-2026:80495
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80496
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80973
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank AISLE Research for reporting this issue.
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