What’s Vulnerable › Vulnerabilities

CVE-2026-86320: Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30
• Weakness: CWE-94

Description

A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.

Affected products

• Red Hat Enterprise Linux 10: all versions — fixed in 0:1.4.4-1.el10_2.1
• Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:1.4.4-1.el10_0.1
• Red Hat Enterprise Linux 8: all versions — fixed in 0:1.2.3-2.el8_10
• Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:1.0.9-4.el8_4
• Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:1.0.9-4.el8_4
• Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:1.0.9-4.el8_6
• Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:1.0.9-4.el8_6
• Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:1.0.14-3.el8_8
• Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:1.0.14-3.el8_8
• Red Hat Enterprise Linux 9: all versions — fixed in 0:1.2.3-1.el9_8.1
• Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:1.2.2-2.el9_2
• Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:1.2.3-2.el9_4
• Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:1.2.3-1.el9_6.1

How to fix

Upgrade to a fixed version: 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; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.0.9-4.el8_4; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.0.9-4.el8_4; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.0.9-4.el8_6; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.0.9-4.el8_6; Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.0.14-3.el8_8; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.0.14-3.el8_8; Red Hat Enterprise Linux 9 0:1.2.3-1.el9_8.1; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.2.2-2.el9_2; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.2.3-2.el9_4. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:80495
• https://access.redhat.com/errata/RHSA-2026:80496
• https://access.redhat.com/errata/RHSA-2026:80973
• https://access.redhat.com/errata/RHSA-2026:84832
• https://access.redhat.com/errata/RHSA-2026:84833
• https://access.redhat.com/errata/RHSA-2026:84834
• https://access.redhat.com/errata/RHSA-2026:84842
• https://access.redhat.com/errata/RHSA-2026:86714
• https://access.redhat.com/errata/RHSA-2026:90896
• https://access.redhat.com/errata/RHSA-2026:92220
• https://access.redhat.com/security/cve/CVE-2026-86320
• https://bugzilla.redhat.com/show_bug.cgi?id=2471023

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